Have i gone off my new boyfriend of 2 months?

Been going out with this guy exclusively for two months. he lives in a different city so not possible to see him more than every fortnight. anyway i thought he was the one but now i'm thinking i don't know if i want a serious relationship. But the last time i met up with him I had a great time but it was almost three weeks ago. We only kiss cos we're christians, but what is going on with me? Does this mean he isn't right for me? I was thinking last night about this other guy I have fancied for two years and how when I see him I feel a lot of chemistry. I gave up on him though cos I thought he wasn't interested. has this happened to anyone else?