Far away, for a long time, from the guy I'm interested in - what should I do?

There was a boy at college that I was starting to get pretty close to. I only knew him for maybe two months while I was at school before coming home on medical leave, so we don’t know each other extremely well yet, but I can’t stop thinking about him for some reason. I haven’t seen him since October and won’t see him again until at least August, maybe later.

There are a lot of other girls at college and I consider it pretty likely that he’s going to find someone else before I get back. What would you do in this situation? Should I give up and start trying to get over him? Should I send him copius amounts of text messages in an awkward attempt to keep up a “long-distance friendship” and hope for the best? Should I just keep doing what I’m doing (that is, Facebook stalking any girl that leaves him comments)?