<human>: Summarize the given text in a few sentences.

I'm an eighteen year old who was in a relationship with a girl also 18 years old in my school for six months. It was intense but we broke up a month ago. 
She was really close to another guy, a close friend of mine, for a long time, and everyone thought they would be a couple. When he didn't make a move, I thought it was okay for me to. I developed strong feelings for her and I still think of her everyday. 
Yesterday she told me she was dating my friend and I don't know what to do now. Either be cool with it and watch with jealousy, the woman I still have strong feelings for be with a good friend, or say no and lose two good friends. I'm eighteen and practical enough to know what I feel isn't love. It feels like a knife twisting in my heart every second I think about them, it is hard not to. I've got my competitive exams(that decide my career) coming up in 2 weeks and it is extremely difficult for me to concentrate, I keep drifting away. I feel like shit and I wouldn't mind ending it all if I found a quick and easy way to do it.
<bot>: My ex I still have feelings for wants to date a good friend of mine. She wants to know whether it will mess up our friendship. What do I do?