Forgetting the past-Remembering the present

I'm Not The Problem. ..

By now if you must think im crazy, super jealous, or obsessed. But I'm really not. Im the way that I am because of the things my girlfriend has done...like flirt with her ex while we were dating, and that lead to a fight but at the end we were good, she blocked him and stuff...until past friday I caught her on ig liking a picture of him. She noticed I saw her and she quickly unliked and unfollowed, I was like wtf was that, and she said she didn't know him. I said it looked alot like her ex and then she got mad at me and changed the subject and talked about me not trusting her. You see? I wanna trust her but look what she does. Im sure she still keep in contact with him when done she says she stopped. And another thing is that all her guy "best friends" are all guys she friend zoned... so every now and then shes talking so some new guy that tried hooking up with her. I wonder how far she's going to take this. Im just letting her hurt me. For now on im backing off, so when we break up it wouldn't hurt much, because I know she wouldnt change for me.