I like this guy Charlie, and he likes me also, what should I do?

I like this guy Charlie, and he likes me also, what should I do? He goes to my church and he doesn't go to my school. I did ask him to prom and he said yes. I texed him "do you like me" and he said "yes". I said I like you to. I then asked him if we can be girlfriends and boyfriends and he said "I will think about it". It was about a month when I asked him that.Do you think he could be waiting to tell me at prom? I told him he has until prom to give me an answer and he is still thinking about it. Is there two different types of like? What kind of like do you think he likes me as? We are friends though. His sister Catrina is also, my best friend. I am 18 years old, Charlie is 17yrs old, and Catrina is 18yrs old