[I apologize for the length, but I really really need advise like BAD right now!]

I just recently started talking to this guy at my school, and I'm crushing so freaking hard. We hung out two nights ago for the first time and it went so great. We click really well, and we never had a dull moment, plus I find him super cute! We had been texting for a few days before the hang out and he showed that he was interested in me by asking me like a million questions about myself, and he would write pretty lengthy text messages. He said he was really intrigued by me and was a little flirty here and there.

Yesterday he didn't text me all day, then I finally texted him late at night and eventually asked him if he wanted to get together on Sunday (today) before I had to go to work, he said he would love to and asked me what I wanted to do. I switched it around and made it so he had to decide, but he had passed out before he gave me ideas..

He didn't text me all morning, then I decided to send him a text saying "..sooo?" and he didn't respond till about 12:30pm and said "Sorry buddy, I passed out and woke up feeling shitty :(" I asked if he was sick and he said he wasn't sure and that his body just feels pooped, and mentioned that he also has hw to finish today. The texts weren't as elaborate, and the fact that he said "buddy" kind of worried me a bit.

I'm terrible at finding the right guys and I'm so incredibly frightened right now. He said he's had a few long term relationships (two of them lasted for 4 years each), so that was a big plus. I told him I've been in way too many flings and I've never even been into them. I'm much more of a relationship type of person. I tried to make that clear, and now I'm not sure if I'm just being a total loser right now and thinking WAY too much, or if he's really just wanting friendship right now and trying to get to know me before he makes any decisions about me. Or maybe he does like me and is pursuing me, but these past couple days he's just been busy (and now sick)..

ADVISE PLEASE! (p.s. I'm 21 and he is 25 and we're both in the same college)

I want to stay relaxed and act like how I normally do around my guy friends - how the CRAP do I do that when I like him? :[