I went out to a student club at my university with a few friends last night and ended up running night game on this one girl. I ended up getting with her for most of the night, while my friend was with her friend.

The girls then went to the bathroom, so me and my friend waited for them. However, after 10 minutes or so they ran out of the bathroom, away from us, and followed some of their friends (all female) who we hadn't met.

Later on in the night I saw the girl and said something stupid, along the lines of "Did you want us to fuck off or something?", to which she smiled and replied "Yeah, can you fuck off haha."

What did I do in order to warrant a) the girls to leave us as quickly as possible, and b) the girl's reaction towards the end of the night?