Boyfriend/Relationship problems

My boyfriend and I are both 20. We've been dating for a little over a year and a half. We both love each other, and we want each other to be happy. But we both have very different personalities. Where he's more of an adventurous, extroverted, crazy type of person, I'm more introverted and serious. He's prone to going out and drinking, and having fun with friends, and I'm more the type to sit inside and read or do homework .(though we both have our moments of being the opposite). We were doing fine even with our different personalities (or at least I was) until a couple months ago, when he really hurt me. We were living together, and I had gone on vacation with my family for a week, and he apparently went slightly insane, contacted an ex-girlfriend of his, and tried to get her to send him naked pictures of herself, and told her that he wanted to have sex with her. He's admitted this to me, and even admitted that if he could he would have sex with a lot of other girls. (Though I know this is how teenage guys usually are). It really hurt me though, especially because I didn't have the greatest self-esteem to begin with, and now it's even lower. It made me feel really bad about myself, that I just wasn't good enough for him (whether physically, emotionally, sexually, whatever). His ex has a personality that's more in tune with his. She's more fun-loving and crazy, and she also has a nicer body than mine, the type of body that he's admitted to really liking. Since then, he's promised never to contact any other girls and do what he did, and he's stopped talking to any of his ex-girlfriends, and appears (after about two months) to really be trying to make our relationship work. He told me that he was very sorry, and that if he really wanted to be with his ex, he would be. He's chosen me. Yet, I'm still suffering from the belief that I'm not good enough, that my life is just a little too boring for him, or that I just don't turn him on as much as some other girl might, or even as much as I used to. To be honest, sometimes I feel as if I would just be better off without him, because though his words tell me he loves me, his previous actions have proved somewhat different. And I don't want to get hurt again. Any advice?

You need to figure out what is best for you, you shouldn't let your self esteem go low because of him. But if you really want to make it work, you could try and change to be a little more open into doing other things