Help me write a tragic ending, I'll use it for my novel

When she realized that she was no longer loved, she finally made a decision. She left him and ended this painful relationship. However, what she did not know was that this short separation was just a death sentence for their relationship. He had been waiting for her return, but he never thought that she would leave in the end. He began to realize his love and dependence on her. He began to try to salvage the relationship, but she had made up her mind. In the end, they met again, but this time, she no longer loved him. She looked at him and felt his feelings, but she couldn't respond. She turned around and left him to chase after her, but she kept running until she realized she couldn't run anymore. She stopped and looked at the sky, feeling the pain and despair in her heart. She knows this relationship is over, she knows he doesn't love her anymore, but still she can't move on She looked back in tears and found that the alley they had walked through had disappeared from her sight. She realized that she would never be able to return to that alley, never be able to return to him. She understood that this relationship was destined to end no matter how hard she tried. She walked alone until night fell. She realized that her life was coming to an end. She no longer had love. She had lost the most important thing in her life. She spent the rest of her life alone until her soul left this world. This was her tragic ending, an irreversible one.