Does he like me--He's in 10th grade I'm in 7th.?

My friend introduced me to one of his best friends at our youth group, and we clicked. He talks to me about such random stuff like he has no idea what he's talking about and we joke-fight a lot (like we had a pillow fight [totally innocent lol] and he pokes me a ton when he's mad at me). We had a moment when we were talking about our personal lives in depth after only like 10 minutes of knowing each other and he's usually really quiet. As in, someone asked him how he was doing and he said 'no' and started texting someone. We went outside at my bff's house and we sat outside for 4 and a half hours talking and holding our sides from laughter. Finally at the end of our convo he goes 'wait arent you like 17 or something?' and I said no, I'm actually 14 in a couple months. Just to put this in perspective, he can drive and I'm still 13. The light kinda went out of his eyes but then he started talking just as usual but was more reserved. About 5 minutes later we went inside and started talking with the guy that introduced us and kept that up for about 3 hours. This guy is the only other person he talks to there besides me, though, and he has opened up to me about his feelings about life and his family and friends and problems. We always talk for that long every time we see each other and he jokes constantly. Does he like me or is he just being nice since he figured out I was 13? And how might I be able to tell whether he has a girlfriend without asking? I dont have a facebook though.