I just need to vent

Me and my girl been dating since we were in high school I love her to death no other girl can ever come in between us no matter what the other day she was telling me about when she fcked this other girl at her old job ( we were broken up around this time) it made me jealous as hell because she never made a move on me... She would kiss on me but when I try to take to further she will move away like I am doing something wrong I feel very offended About that too.... I told her how much I want her and she says she wants me too but her actions isn't showing it. It is really getting to me and I just don't know what to do.