Nebula, your jealousy is going to eat you from the inside out. Whatever happens with this guy, you'll have the problem.

Either you can trust him or you can't. It's not really something you can control. You CAN control how miserable he makes you every few weeks. Are you clear about the fact that you want him, but you don't need him? Do you know that you're in this relationship by choice and you could walk away whenever you want?