20/M here. Roommate is 19/M. His crush is a 18/F freshman. We all go to the same university. Me and the girl have been kind of an acquaintances before she got into university. 

My roommate openly expressed his attraction for the girl to me. They recently got to know each other a few days ago. Me and the girl are taking the same course this semester, so I'll be seeing her every week. She has given me signs of interests quite a lot and I tried to brush it off as a respect to my roommate but I though fuck it and flirted with her. She seems to be receptive to it as well.

WIBTA?