So me and my bf have been together for 7 years and me and him a baby together and be is a father to my daughter. We are also supposed to be getting married but lately he has been on my case about cheating and it's really getting to me like it's annoying. About two weeks ago I caught him on Facebook talking to another girl it took me two days to get an explanation out of him.the explanation was that it was his cousins baby mom and it's a restraining order so he was being the peacemaker I said ok and that's it. But today he came to pick up the baby. So I took my other daughter and we went to the store to get snacks but later I got a text from him accusing me of going to another man's house.i told him I was going to the store but he doesn't believe me and I never cheated on.what should I do?