I'm in a 5 month relationship with my girlfriend and she is bisexual..now i love her very much and all but for some reason I don't trust her..I always catch her with sneaky behavior and I think she is cheating on me. I told her about this type of behavior and she said she will change but i still suspect sneaky things going on.. How should I go about this with not getting hurt in the end? ( I'm a guy by the way..and the sex life is great i.e threesome..but i'm tired of it and I love her and just want her to myself)