Ever Loved someone that didn't Love you Back?

Ever Loved someone so much that it seems no matter what they do you don't love them less?
Well, I have.
I fell in love with this person one time, and He didn't treat me right. He loved someone else more than he loved me - and he always said it. So Basically, I was the 'spare' - The one he used to keep warm because his 'love' was in another university.
There was this one time. I went to Visit him in His Hostel, and just when I was approaching his room, a girl (who'd I call AB) was leaving.
He said she was just a friend. I believed. Why would he lie? Afterall sincere enough to tell me about the other girl in another school.
Two weeks Later, I was in a friend's room sleeping. AB there too - she turned out to be a friend of my friend's room mate. I woke up to gist of AB Telling Her friend how 'good' My 'supposed Boyfriend is'.

Radical Love

.I would see the worst in you
And still give you the best
I would see you pale and blue
And still pick you out of the rest

.You would still make me smile
Even when all you do is what is supposed to make me frown
And though you think I perceive you as someone filled with guile
All I still see is your beautiful crown