I broke up with my girl of 2 and a half years when i found out she cheated on me, while i was in vermont (she was in PA)
It was tough for the first 3-4 weeks, and i thought about how much i missed her....but in reality i didn't miss her at all, i just missed having her (if that makes any sense). Here we are 5 weeks after the breakup, I met a new gal whose 10 times better then the first one, and I couldn't be happier.
It is hard dude, but it DOES get easier, and everything happens for a reason.