<human>: So I was hanging out with this girl in some of my classes. It started as just being purely a friendship, I wasn't interested in her at all at the start, but I developed some feelings for her as time went on. I have a good friend who is also in our classes, and he was never interested in her ('explicitly said she wasn't his type'). Anyway I found out through another mutual friend she was more attracted to my mate than me (she knows we know), he also found out he has started displaying interest in her now. 

I don't know what to do here, I accept she doesn't like me (and am fine being friends as that's all I initially wanted), it's the fact I am forced to see them every day. When ever they are in the same room together I feel sick and i'm awkward I have to leave. How do I deal? I have never been in this situation before, and am open to taking any route here as long as I can justify it.

Give me a shortened version of the text
<bot>: Met girl->became friends->developed feelings->she liked my friend->friend decided he wanted her->in same course so sadness. How to deal with it?