haha yeaaa, that can make it tough (please understand that i'm not laughing at you, just with due to the unfortunate irony).
Well... hmmmmm it is quite possible that he can never love you in a physical/sexual sense. As for me, I'm 22 and I went through a bi phase from around 20-21. I don't regret it, it was fun and i was curious (the type that tends to try everything once). Looking back, i think tried it b/c of the emotional state i was in, which wasn't necessarily negative, just.... i don't know... less of the desire to be the masculine need to be in control and in charge. I might be more open to talking about it in not-so-public forum.
Anyway, back to you, if you do love this person you need to understand he's not in a place where he feels comfortable expressing emotions of affection in that way. If you do love him, be good to him and help him grow. Maybe one day he'll feel comfortable enough... but this might be a long stretch.
You pose a very interesting question/issue and i guarrantee i'll be thinking about this for a little while.