I have a class with a friend and we both met an attractive classmate, let's call her Dana. I thought she was cute but didn't think much of it, meanwhile my friend falls head over heels for any girl that even remotely sparks his interest. He goes on and on about her after class, (which really annoyed me because he does this with every girl he likes)  so I encourage him to talk to her. He does but remains friendly about it, never really giving her a flirtatious vibe or anything like that. 

A few days later I realize Dana is in a separate class with me. I try to do a little mission and see what she thinks about my friend. Turns out she finds him "nice" but not feeling him in a romantic way. I let it go. I try to get my friend to learn some flirting style tips and even asked a female friend to give him some advice, it goes okay but not with Dana.

That weekend I go out for a little bit around the Delmar Loop shopping district area and run across Dana again at a record store. We chat it up a little bit about some bands we like and she invites me to her apartment to listen to some vinyl she just bought. Turns out we have lots more in common and things sort of escalate from there. Some things happened and while it felt awesome I did feel really guilty. My thinking is my friend never made a real move and it's not like me and Dana are like a couple. What do you guys think? If I am the asshole I will accept that, I just hope I don't lose a friend over especially, especially over a girl that neither of us are dating.