Lessons I learned from 4 years of successful (and unsuccessful) dating in college (overwhelmingly fraternity boys):
-Don't believe it when they say they don't have time to hang out with you, unless it's during finals week or something equally important.
-Guys need their guy time, just like you need time with your girl friends. If he's hanging out with his friends, use that time to hang out with yours.
This always avoids the clingy situation.
-On the other hand, if he's spending so much time with his guy friends that you joke with your friends that they're dating, that's probably too much. (I dated a guy who would go to his friend's house after class at 4 and stay there till 2 in the morning. Every day.)
-Guys who LIKE you and want to be with you, not just hook up, DO take you on dates. I know it's easy to make excuses (he doesn't have a car, etc) and while that can factor into the equation, don't make excuses
for him. You deserve to be treated well, and hanging out doesn't have to be expensive: meet him for lunch in between class, even going to the library can be more fun with a boyfriend (not very productive though

)
-Drunk dials are a tough one. Personally, I go both ways when I'm drunk: I either say things I'm too nervous to say sober, or I come up with off the wall things I've never even thought about sober and have no idea where I come with it. Like you said, you followed the 'actions speak louder than words' philosophy, which I think should be done sometimes. But if this is a recurring thing, he's probably too big of a loser to break things off sober, and when he wants you back, he is able to explain his behavior as drunken stupidity.
Overall, the guy who wants to be with you is going to make the effort and make it known that you're the one he wants. There won't be any "where do I stand/what are we?" confusion. Trust me, you're both very young, and this comes with age, experience, and maturity. In the meantime, I think you should cut this guy off, atleast for summer. Use these couple months to forget about him and hopefully when you return in the fall, he'll be a distant memory.