Okay, take a deep breath - now focus!

You need, need, need to get your grades back up. If it helps, write this guy a letter - pen and paper kind, and in it say everything you'd want to say, then DON'T mail it! Sit on it, stash it away, and if you find yourself thinking about him instead of schoolwork, reread it, adding anything necessary, then move on.

A friend of mine ended up having to pay an extra year (thousands) of college tuition and redo and entire year of school because of a similar situation - don't let that happen to you!