Sounds like you are really awful at reading "the signs." It might also have something to do with the fact you mention your birthday, like a 12 year old would to extra complain about not getting the last slice of pizza. Nothing kills a libido faster than a dude acting like you owe them sex.

u must have done something u aren't aware of

She can’t multitask? She should be able to play on Instagram while you claim your obligatory Birthday Anal.

What the hell was your move? Grabbin a tit? Sticking your fingers in her buttcrack? Doing the helicopter? Whatever it was must have hit her privates like the Sahara Desert. Sounds like you need to ask what she likes in foreplay instead of assuming. Nothing is a bigger turn off than your partner making no effort to learn what you like. Well, except for acting like you’re owed sex.

Was most likely writing your insta happy birthday post!

Geez O Peet's people/kids. He is just on here to complain like the rest of us. Sometimes life is just an FML. Let him have it. (Are only children on this website now?) As an ADULT, many of us have had this happen now and again, and sometimes we just wanna bit*h about it. It's Allowed! That's what FML is here for!!!! ** I feel for ya bro/OP ** Better luck & vibes your for your next birthday!