[Neva]

Well in all seriousness two things come to my mind right away:

1. You're terrible in the sack
Maybe learn some new moves and get some skills so she's not thinking it's a "chore" that she doesn't like.

2. She's getting it on the side.
Chicks have needs just as much as us guys do.

I'd leave her either way. I'd still leave if it's something else. It's pretty obvious she doesn't have any respect for you with her lack of communication whether my guesses were right or not.

Too many girls in the sea willing to s your d to be hung up on one that won't.

My two cents.