Love issues: Can I trust this guy or not?

i am with a guy that i am not sure i can trust. we have been together for almost a year and will be taking a romantic trip together next week. i have a very painful relationship in my past that i am not sure i can get past. i have been trying to for over 2 years, yet still think about my ex every day. the guy i am with now is a total opposite of me. i laugh alot with him and like how i feel when i am with him (sometimes). things have changed recently with us. i know all relationships go thru ups and downs, i'm just not sure about him anymore. i worry that my comcerns with him may be because of my last relationship. yet we are so different, i worry that it is my gut telling me to take a reality check. i also have a close friend that has recently gone thru a divorce - it brings back alot of memories for me and i really sympathize with him. we were once interested in each other romantically, it just never had a chance to happen. i have heard rumors that he is interested still, but i don't want to be the "rebound" girl. i wonder if i am just confused about my current relationship b/c of all the things happening just now. i feel that i love my boyfriend - i worry that i am not "in" love with him. i know from experience that there is a huge difference in the two. i just spoke with him and he informed me he and a friend will be opening a bar in the next year, and i don't know that i trust him to be around young, scantily clad girls and not cross the line. we are both in our late 20's and he is a year younger than me. i have always dated older men, with the exception of my ex-husband. i just don't tend to have good outcomes with younger men... i want to know if i am generalizing relationships b/c of my past or creating reasons not to be with him b/c of things that don't have to do with him? please help...