A girl killed me.

Do you love her? Do you still love? If you still love her, just let her go. To really love someone is to make that person happy. Whether she loves you or not, it is true love. I certainly don't want you to be a saint, but what can you do to get back at her? You can only make her hate you. Instead of making her hate you, let her feel guilty and regret for you. She will remember your kindness all her life, and she may come back to you. See if you can dislike her between the lines. So don't retaliate against her, let her conscience condemn her, and don't deny people's inner conscience. That thing exists, especially in women's hearts.