Paranoia's cute in moderation, it shows you care and so on. But if you overdo it, it becomes insulting (especially if you couple it with total outrage at any suggestion that you
might cheat, which so many people so often do). Trust is a two way street, and people who never let a partner off the leash for fear of them cheating are in ****ty relationships.
My advice is to make an effort to put yourself in more situations where he
has to trust you
. It might help you empathise more. I don't know if it's the case with you, but most of the people I've met who are paranoid in relationships don't have very active social lives - I think sometimes they're more envious of their partners than jealous of them.
Oh, and srsly: paranoia is NOT inevitable in relationships. Not sure why you'd think it was, but it isn't.