Well I met this guy through my friend Roxanne awhile back, and him and her dated for literally four days and he broke up with her. I always thought he was cute and I guess he thought the same. Roxanne said she didn't like him anymore because he could never make up his mind and he didn't take the lead in relationships and whatever. So two days ago, me, him, Roxanne and a couple other people go drinking. Anyway I kept catching him looking at me the whole night and he kept looking away. So later on that night he went for a cigarette and came back and put his arm around me and we started talking and flirting because Roxanne said she didn't like him. Anyway time passes and Kristina wants to go home so Roxanne drives her and Tiago (the guy) and me ended up kissing. A lot. So Roxanne somehow manages to drive Kristina home in like under ten minutes when it would usually take 20 minutes just to get there. So I say no I don't need a ride home I'll grab a cab and she left looking upset, but I figured whatever, she's mad because I made her come back. So anyway more and more as the night goes by we're kissing a lot and making moves on each other. So finally we all decided to leave and Tiago said I could crash at his house. So we ended up having sex of course. And he admitted that he really liked me since the first day he saw me. And he wanted to see me again soon. Now I find out Roxanne likes him, and it would bug her if me and him dated(she doesn't know we had sex.) This makes it her fourth crush. Matt, My brother, Kristina, and now him. Should I pursue dating him? I mean I know he isn't interested in her, but would it be a bad thing to do to her?

I have a boyfriend so I'm not worried about that. I guess I was trying to make things sound the way I wanted them to though. Sad how he has to ruin our friendship over such stupidity.
You posted this April 12th, so in a week you have already had sex with your friends cast off, but nothing said about the b/f. If we are to believe you, then your in it for the quick sex anyway, so that's what you have. Doesn't matter how your friend feels, as your going to do it with anyone you like. Why worry about it, as you don't care any way.