In this fanfic, it could even be her best friend's partner who has been secretly interested in Sakura and cheats on her best friend with Sakura. This would add an extra layer of drama and betrayal as it not only affects Sakura's relationship but also her friendship.
In the 'sakura gets cheated on fanfic', perhaps Sakura is deeply in love with her partner. One day, she catches her partner in a compromising situation with another person. This betrayal makes her re - evaluate her relationship and her own self - worth. She may then have to decide whether to forgive and try to work things out or to end the relationship and move on with her life.
A new student in the school could be the one to save Sakura. This new student might have had similar experiences in their previous school and decides to take a stand against the bullies when they see Sakura being harassed.
Another possibility could be a new character introduced in the fanfic. This new character might be using Naruto to gain something, like power or influence in the ninja world, and when they get what they want, they cheat on him. It would add an element of mystery and betrayal to the story.
There could be Naruto. Since he's Sakura's friend, he would likely be involved, trying to help her deal with the curse mark. He might use his own powers and experiences to support her.
One possible plotline could be Naruto's initial shock and disbelief. He might go through a period of self - doubt, wondering what he did wrong. Another could be his journey to find himself again after such a betrayal. He might focus on his ninja training more intensely to distract himself from the pain.
There could be some new and unknown characters in her team. Maybe some young and eager rookies who look up to Sakura for her experience.
Perhaps an enemy from a rival group. They might see Sakura as a threat to their plans, so they poison her to get her out of the way. Another possibility is a character who has been secretly harboring a grudge against her for a long time, and finally decides to take action by poisoning her.
Another plot could involve jealousy. If Sakura becomes jealous of Naruto's growing popularity and power among the villagers, she might betray him. She could spread false rumors about him, which would lead to the villagers turning against Naruto.
Well, it could be that Naruto misinterprets something Sakura says to Sasuke and makes a comment that offends her deeply. Sakura, being the strong - willed character she is, doesn't hold back and punches Naruto. This could then start a chain of events where Naruto tries to make amends, and through this process, their friendship becomes stronger as they understand each other better.
In many SasuSaku fanfics where Sakura gets hurt, it often leads to Sasuke becoming extremely protective. He might go on a rampage against those who hurt her. For example, in some stories, if Sakura is injured during a battle, Sasuke will use his powerful jutsu to defeat the enemy without mercy. It's a way to show his deep - seated feelings for her that he might not always openly express.