Hello LittleForgetMeNot, nice to see you again.

I've been in similar situations many times, and to be honest the best way to go about it is to seize all communication with him. That's what helped me. I'd even have the trembling feeling when I thought she was calling me or coming on Myspace or what have you, but what got me through it was completely ignoring her (although there have been more than one). You are young and it will get easier with time. You will get used to long relationships, heartbreaking break-ups, and all of that kinda thing. Just a part of life. The bad thing is though, by starting this communication up again you might be inclined to start a relationship again even though I am sure you realize it's not the best thing for you. He's going to sit there and try to say how heartbroken he is over here and all that blah blah blah and try to get you back. Looks like he's just using you to get over her, and you don't want that so be careful.
Best wishes