Most Helpful Girl
Story of my life, but time will tell. Look at how much time and effort he invests with you. If he wants to see you, talk to you, go out on dates, he remembers things about you and tries to be a part of your life, wants to get to know you, and wants you to get to know him, etc. then don't worry too much.
My boyfriend and I started out similar to how you guys did, met and had great chemistry, moved kind of fast and he's the type you describe so I wasn't sure if it'd work out, but I just relaxed and went with the flow, didn't push anything, and four months later he says he's in love with me and we're officially a couple.
Sometimes there's no way to know if a guy will stick around, and that's a risk, but you have to just use good judgement and be willing to have a little faith in a guy you think could be the right one. The worst that happens is he breaks your heart, and that sucks, but you'll heal and move on to a new guy.1THIS IS NOT RELEVANT ANYMORE