Am I just being WAAAY to paranoid?

Okay so I have been with my boyfriend for little over a year. We went out for like a month then broke up for some dumb reason then we started going back out a few months later. Im 20 and he's 23. We bicker like crazy but never have had one serious fight. He means so much to me and he is nothing but good to me. I'm actually the first person he has ever said "I love you" too and he didnt say it until a month ago so obviously he means it and he isnt trying to use it just to use me or anything. But the thing is he has had with quite a number of girls before me and only had one serious relationship (which he never told her he loved her either) and before me the last time he had was a over a year before we did. But I get soo soo scared that he is going to cheat on me. He has this new job where he goes to diffrent colleges over the country for weeks at a time and I get so extremely scared that he may be hooking up with other girls while he is out there? Am I paranoid or what can I do?