I am so sorry you are going through that. I went through that with my boyfriend (he's been with me for 2.5 years) and he's really closed himself off with me because of it. I pushed him away far too many times by accusing and assuming he's cheating on me. Many of my friend's have told me that he will do what he wants and even if he was cheating on me there's nothing I can do. I know that doesn't help, and I know that it is probably scary thought, but look at it this way okay? You cannot make his mind up for him right? You cannot chain him up and worry about if he is doing you wrong. You think and worry about stuff you cannot control then all you are doing is hurting yourself. Love is a leap of faith girl, if you love someone trust them, if they hurt you, you learn from it. Notice how I said LEARN not fear. Don't let fear consume your relationship, I know I did.