attachment

Right I've been seeing this guy for like a month and I've been doing my best to not get to attached incase he decides he's not that into me but I'm getting to a point where I'm really starting to like him. When I leave him I wanna be with him again and that is terrifying because 1 I can't be all the time and 2 what if he decides he doesn't feel the same. How do I stop me jumping in to quick and getting hurt?