The most important part of everything that you talked about is the TRUST thing. And I'm not talking about whether or not he has cheated, or will cheat, or is cheating or anything like that. I mean, you need to trust him enough and trust yourself enough to TALK TO HIM ABOUT HOW YOU FEEL. These things you are feeling must be brought out in the open in a way where you both can talk about them and he won't dismiss them as rubbish and will realize that they are real, genuine concerns of yours. And, I would not marry him until you do this.