Its rare this happens... but there have been a few times when i was around a woman that does it for me in every single way. Beautiful, sexy, intelligent, down to earth, unselfish, cool, just every single thing I ever wanted in a woman.
And I wanted her so bad that I thought about her when I woke up, before I went to sleep, I dreamed about her, I literally craved her because I was in love with her.
And her not wanting me back was at the time one of the worst feelings I ever had.

Especially if she wanted to be my friend but didn't want to be my lover. So that means you're talking to me, spending time with me but it only goes so far.
It was literally torture and I wish that on no man. I'm telling OP to do what I wish i had done... walked away.
Better that than slowly killing your spirit being all up under her when you love her but she doesn't love you. No man should have to feel that pain