Problems with relationship?

Me and my ex broke up quickly. There was just to much drama between his friends about us and it was too much for me to handle. He said it wasnt a problem, but it as to me because his friends made me feel uncomfortable. We broke up and we started talking about 4 months later. Also, I told him that I didnt want much from him (cept for him to go to college) He said schools not for him, but I said just try for me. He said he would try in the fall of 2011. But I have learned with other things that he is all talk. He is nice takes me on good dates, but under neath it all its a mess. We are 19 and he txted me that he wanted to marry me and have children with me after we've been talking for a few weeks (we didnt make us official yet). I told him that was way over board and such. And now he's all like I'm sorry. I know he is sorry but he is all about talk and then just said whatever i wont talk about marrying you ever again. Immature? I think so. Should I finally let him go and move on?