Relationship at breaking point :'( !!!?

I have been in a relationship for over a year now and it has been the best time of my life.: I have been in a relationship for over a year now and it has been the best time of my life.: However, I have had issues with trust following a few 'bad' previous boyfriends. It hasn't However, I have had issues with trust following a few 'bad' previous boyfriends. It hasn't affected us too badly so far but the more I fall for this guy the more scared I get that i'm going to get hurt like I have in the past. My boyfriend is a lovely guy and although he has told a few fibs and kept some things from me, on the whole he is perfect and I know he worships the ground I walk on. Yet whenever he goes out with his friends (as in out drinking) i'm convinced he is either going to cheat on me or wishes he was single/with somebody else. I have never said he can't go out and I never would but when he does I spend the whole night worrying. It makes me think I should sort my trust issues out before this goes any further bu I just don't know how to go about doing this. Everytime we co front the issue we meet up and end up backto normal...until the next time. We're just going around in circles and really have reached breaking point...what do I do? How do I improve my self worth? Do I stay with him...and if I do how do I learn to trust?