Yeah, car chick ... that's the situation he put you in ... not maliciously, because his feelings were there before he knew who you really were, and they clouded his judgment when he found out.
I'm sure lots of us would pay dearly for a "fall out of love drug" but there isn't one. All you can really do is something every cell in your body (literally ... i can bore you with the hormonal chemistry but I won't) tells you you don't want to do.
You have to put him in your past, and he has to do the same with you. This is the price of your deception, and you have to own up to it because it was your fault.
This means not just deciding not to date, or kissing or not being his girlfriend ... it's much worse ... it means taking him completely out of your life now and forever! No calls, no emails, no IMs, nothing!
I'm sorry I can't give you more cheerful advice, car chick ... but it's your only hope for being with someone age-appropriate that you can fall in love with. Before you object ... remember, he needs a realistic life too so do it for him, he deserves no less in HIS romantic life with girls who are right for him ... you aren't!
Carl.