I need help with my boyfriend

So i absolutely love being with my boyfriend. He’s amazing but he also has some major trust issues and keeps expecting me to act like his ex.

A little backstory on him. He was engaged and lived with his ex for a long time. She cheated on him several times but he didn’t end it until the last time she cheated.

Now we are having issues because I can’t spend 24/7 with him because of school work and family. I see him as much as I can but it’s not enough for him and he gets really upset. Also he keeps telling me he is scared for when I move back into my dorm thag im going to cheat on him with one of my friends or something. I have never done anything to make him think I will cheat and I’ve stopped hanging with my male friends to make him stop worrying.

Basically I want advice on what to do to make him stop getting upset with me over things I can’t exactly control and for him to stop comparing me to his ex