Haha, I know how you feel man. I've liked this chick for the past two years. When she found out about a year and a half ago, she told me to wait for her because she liked me, but didn't want to break up with the guy she was going out with. Confused the hell out of me, but I did what she said. It's been a year and a half since she asked me to wait... and I still am. I'm going ******** insane about it too. One minute she's all, "Ooo *blushy* *blushy*!". The next she's all, "You're friend is more entertaining than you! So I'm gonna go hang around him!". She gets me so pissed off sometimes, but when I walk into school the next morning, she's walking past me in the hallway, smiling her smile. I can't forget.
So she's not technically my "ex" so to say, but the whole forgetting thing is the same process.