Ex girlfriend gets mad for things i do ?

Ever since me and my ex broke up three months ago she always contacts me and gets mad at me if I do something she doesnt agree with . Like I went on a site to find friends and she thought I was finding other people to date . She cried to my friend on the phone about it while in that time she started dating someone else and I had to find out about it for myself when he picked up the phone and whgen I called her house . I visited her one day and the same day I sae her was the day I found out she had a bf ( wasnt there It was after I left her house way later on in the evening).She told me that she cant be fully open with him like she was with me and says she cannot get over me and stuff. Just recently she was bitching at me because I got drunk a few times and i Never used to drink when I was around her and she called me a drunk and a poser and stuff. She said shes hurt and she keeps sending me hate emails about it and stuff .She also got mad when I told her I wasnt wearing her earrings she gave me and she sent me a sad face with a email saying please dont let them close up or what ever. Like she has a bf now so i dont know why she bothers to care about what I do when she did worse and stabbed me behind my back going out with someone else and not telling me . I cant tell what her problem is . Does she want me back or just to control me because she did say she still cares bout me and doesnt want me making any bad choices but idk if she wants me back or not. whats going on here?