What has someone said to you/about you that hits you hard, and leaves you awestruck and bothered?

What are some ways to heal abandonment wounds? I 23F tend to forget about self love and living for myself when I get into relationships, so when a breakup happens, I am left feeling like I don't know my purpose.
Have you ever get to the point that even when someone says that they are sorry for something that you don't believe them?