Well since you haven't told us what you said, it's hard to give insight. But if she truly was just a fuck buddy then forgetting her birthday shouldn't matter. Boyfriends should get in shit for forgetting special days, not friends you happen to be having sex with.
Daft, ya silly cunt. You are probably the best qualified gamelive poster to answer this.
Common.
Daft, did you ever have a fukk buddy dump you and within 3 hours have another one you picked up from a bar?
Daft, being so goodlooking has its perks eh?