So today I was getting on great with a girl at a gig I played... Got to a k-close, however someone I know had jumped in while I was away without realising that I was actually flirting with her. He ended up getting close to her too. This doesn't bother me as I'm only looking for an eventual f-close but who knows what she/hes thinking.

Anyway my point is is that now me and this guy are friends with the girl on facebook, but however, due to a few field games ("i have to go pack my equipment, will be good to talk again though, swap numbers in case I don't see you later?" Although could've done it anytime) I got her number. Usually I leave it for a bit before texting, but as we speak the other guy and the girl are chatting on fb, I can't as I have work so gotta go sleep.

What's do you guys think I should do in this situation?

TL;DR: me and other person flirted with same girl without realising, both got fb, I got number too, need advice on situations like this as it happens a lot with me