Boyfriend Confused.

I've been with my boyfriend since I've been in 8th grade. I am now a Junior, and he is a senior. I am a jealous person, and he can be jealous too. I feel like I'm always getting jealous over things that maybe I shouldn't. I talk to him about it, and he respects how I feel about it. It is never really him doing them, most the times it's the girls. But sometimes it is him, you know how you can just be having fun with your friends, and it looks like flirting but it's really not. That's it. He's the best thing that's happened to me, and I don't want my jealousy to get to out of control. Before I do anything I put myself in his position and see if he would like it if I did it, or how it would make me feel if he did it to me. Sometimes he understands things, and then other times he trys but doesn't queit get it. Or if we're talking about a relationship in our school that has broken up because of cheating or something I'll say "you wouldn't do that would you" and of course he'll say no. But sometimes I feel maybe I'm going over board. I can't really help me being jealous, it's not like physco jealous. I guess it's just that I speak my mind. Also sometimes I will be sitting around and start to think about stupid stuff, just to get my self mad. I don't know why but I will try to think of things to get myself mad. You know how highschool is and always rumors going around. My boyfriend would never cheat on me, or even lay a hand on another girl, but many rumors have been started to try to break us up because that's what people do. I've talked to him about stuff I've heard, and sometimes he gets mad because he doesn't want me believeing it. I never really believe it but sometimes you do wonder you know? Also me and my boyfriend lost our virginity to eachother when I was a freshman, and he was a sophmore. It seems like lately when ever we hang out we have sex every single time, and sometimes even twice. Is this bad. Please comment, and help me. Thank you.