Most Helpful Girl
Most Helpful Guy
Hmmm, well now you're kind of trapped into being cool with it because you said you were. I think you need to ask how serious she is about him. Honestly yes, I'd keep getting to know her but I'd tell her if things keep going well you're obviously going to want her to choose between you eventually and you should let her know that.
Also, condoms dude. You don't know who else he's talking to.