I recommend a novel in which the male protagonist returns to the modern world due to a false betrayal and then reconciles with the former female protagonist.

It seemed that he was the one who cured his ex-girlfriend's injuries when she was cultivating.

Answer 1

I don't think it'll necessarily meet your needs, but I'll try my best to recommend a novel that's most relevant to your description."The Female Supporting Character Has Gone Dark" is a modern romance novel written by the author, Stable. The general plot of this novel is as follows:

She had transmigrated because of a car accident, but she had transmigrated into a novel that she had just read! Her identity was still just a female supporting character who was cannon fodder. She had no choice but to get to know the villain Boss in the novel. In order to protect her life and her family's safety, she hugged the other party's thigh tightly! Let's see how the little cannon fodder will outsmart the female lead, hook up with the villain, and make a name for herself step by step!
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"After Dressed as a Vicious Supporting Female Lead, I Successfully Exchanged" was an ancient romance novel written by the author, Zhiyou. The general plot of this novel was:

Qin Nian would never have thought that she would transmigrate because of being struck by lightning, and she would even become a vicious female supporting character in a book! She had even inexplicably bound herself to the whitewash system because of this. She decided to fight the system to the end! While she was actively completing the mission, she continued to play the role of the evil female supporting character through the loopholes in the system. However, in the end, she realized that things did not develop as she had imagined…When she was framed, in order to maintain the evil female supporting character, she was about to admit it when the female lead, who should have hated her to the bone, said,"Sister is kind. She couldn't have done this!" "With me here, who would dare to touch her?" The male lead who had wanted to kill her said. Other than that, there was also a certain cannon fodder supporting character in the original novel who suddenly appeared, threw down the word "boring", and directly took her away. "?" What was going on? Even cannon fodder dared to be so arrogant? What exactly went wrong with the vicious supporting character that she had worked so hard to create?
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The book "Transmigrated into a cannon fodder female supporting character" was an ancient romance novel written by the author, Little Ertu. The general plot of this novel was:

Lin Xiaoci had transmigrated! Her identity was a vicious female supporting character in an ancient book. In order to get close to the male lead, she had been courting death. After learning the truth, she decided to stay away from the male protagonist's family and cherish her life. She swiftly drafted the divorce papers and sent them to the man who had no choice but to marry her because of the original owner's scheme. I let you down when I used you in the past. Now, I'm giving you back your freedom." The man grabbed the divorce papers and crumpled them into paper scraps. He said fiercely,"Dream on!"
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The book,"Cross-dressing as a Man: The Reborn Enchantress's Eternal Love," was an ancient romance novel written by the author, Yao Yan. The general plot of this novel was:

A red card killer. She, who had a limitless future, had actually transmigrated to ancient times! This transmigration game was really too tragic. He was almost instantly killed the moment he transmigrated. He fought with his stepmother and fought between two handsome men. Memory loss was fine. Don't worry, a big wave of idiots is coming! More and more mysterious people appeared to help her. Let's see how she will get rid of this huge conspiracy and fight with the man she loves the most...
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"Love and Hate: A Thousand Years of Calamity" was an ancient romance novel written by the author, Leng Qiufeng. The general plot of this novel was:

After searching for thousands of years, when she finally came to his side, he had indeed run away from his marriage. In order to explain that she was the lover he had been searching for all his life, the female protagonist had traveled thousands of miles and experienced life and death. When she was free to tell him one day, he already had a new lover! "If you dare to be rude to her again, I'll cripple you!" The male protagonist said fiercely as he strangled her neck. The female lead widened her eyes and looked at the man she loved deeply. She bit her lower lip."I'll make you pay the price!" The plot is fictional, please do not imitate it.
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The Story of Abandoning a Woman and Turning Her Body Over was an ancient romance novel written by Happy in a hurry. The general plot of the novel was as follows:

After she was abandoned by her fiancé and her family was destroyed, she was so sad that her personality changed drastically. She went from a traditional woman who followed the three rules and four virtues to a legendary woman who did things that made people's jaws drop and was sincerely praised. She carried forward her family, became famous all over the world, and became a new coordinate in the business world. He was vain. In order to win the favor of a rich girl from a rich family, he abandoned his fiancée from a declining family. In the end, he went from a graceful young man from a scholarly family to a down-and-out young master abandoned by a rich girl. When the two of them met again, she turned a blind eye to him, but he looked at her in a new light.
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"Counterattack of the Supporting Female Character: My Princess Consort Is Too Scheming" was an ancient romance novel written by the author, Lu Yazi. The general plot of this novel was:

Su Rao was also wearing a book when others transmigrated, but she was wearing a book. Other people who transmigrated came with their own combat skills and were good at fighting. Her transmigration…was a pity! She was summoned by a female cannon fodder to help her fight in ancient times! Simply, he felt a dense malice! This was simply a warning of a chaotic battle! The reborn woman said that you can only return to the modern world if you help me get rid of my tragic life as a supporting actress. For this sentence, she had no choice but to keep fighting and arguing! However, the heavens loved to watch a good show. Not only did they make the white lotus female lead turn dark, but they also took the initiative to attack her. The Han papers that should have liked the female lead ran over and surrounded her. Especially that male supporting character. Instead of being a bystander, he actually wanted to make a comeback and become the male lead! Brother, can you…just follow the routine and be the supporting male lead?
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"Return after a Thousand Years of Abandoned Love" was an ancient romance novel written by the author, Fool. The general plot of this novel was:

When she first arrived in another world, she forgot her previous life, mistakenly entered the palace, and married on behalf of her as the queen. The emperor's love was as deep as the sea, but she was willing to do so. When she let go of everything and jumped into the sea of fire, she realized that she was just a sacrificial object used by others from the beginning. Her body had been destroyed, and her soul had no one to rely on. Her past life and present life were all in the past, but her powerful resentment attracted the devil to make a deal with her. She would definitely be reborn after being unfeeling and breaking love. She would look down on the world. This time, she would definitely make all those who betrayed and lied to her pay the price…
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"Quickly Wear the Female Lead, She's Going to Die Again" was a sci-fi space-time travel novel written by the author, Qing Luochen. The general plot of the novel was:

There were always some people in this world who started off well but ended up losing miserably. Because of the chaos of time and space, Wangyou was forced to become one of these short-lived 'favored sons of heaven' and embark on the path of the king who usurped the throne. Before the mission, System: With a beauty in hand, you don't have to worry about maintaining the plot.(*^▽^*) During the mission, System: Master, Master is the backing of the female protagonist. You can't snatch it. Master, Master, that's the female lead's opportunity. You can't take it away. Master, master, that's the male lead of the female lead. Please let go! The System who had given up on healing after completing the quest looked at the man who had been eagerly chasing after its master and wept with sympathy. A certain man: "No, no, no, I don't need sympathy. Because sooner or later, I'm going to become her man." [PS: 1v1, Shuangjie, companionship is the longest confession, fine male lead, counterattack, face-slapping sweet pet cool text...]
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"Crossing Books: The Second Male Lead Said He Wants to Marry Me" was an ancient romance novel written by the author, Luan Hua Jianyu. The general plot of this novel was:

Once she transmigrated, she arrived at the novel she had read. She was the fat concubine who had just been divorced by the prince. She lost weight, treated the sick, and saved people. Her life was especially happy. She did not even look at the crematorium where the prince chased his wife. This was what the Host did. The second male lead was moved by her, but she did not even look at him. This was what the Host did. After some time, it seemed like it was time for her to have a passionate and sadistic relationship with wangye. As long as she followed the original plot, she could successfully return home. However, the plot had quietly shifted…The plot was fictional, so please do not imitate it.