Last weekend I hooked up with an acquaintance. We've known each other for a while but we've never been close. After a night at the bars we decided to go back to her place and we ended up having sex.

Usually I keep in contact for a couple of days afterwards. This time, I somehow managed to loose her contact info and now I kinda feel like a douche because I haven't spoken with her since.

What do you guys think I should do? Should I apologize next time I see her? Should I mention it at all? or just forget about it?