If you're feeling like you want something more permanent, talk to him about it. See if he's on the same page as you. Before you have the talk, know what you want in a relationship, what you can handle and what you can't. Worst thing he can say, is he doesn't want a relationship. It'll suck, but at least you know what you want in a guy and if he can't give you that, then it's his loss.
Communication is the most important thing in a relationship, you should be able to talk about pretty much, anything with your significant other, no matter how big or little the situation or problem is. Keep that communication open at all times, trust me, you both will be happier and you'll understand each other better.