Vigs said:
Get out! Get out right now!
That is what I was married to for 12 years. A low sex drive woman will screw your mind up. It doesnt happen over night, but eventually you two grow to resent each other. You for not getting your needs met. You start doubting your attractiveness, and bedroom skills. You lay there horny wanting to initiate sex, but dreading being refused sex. You will try to understand (and fail) why it is that when you do have sex it seems awesome for her, but she just does not want it much. It can drive you crazy.
She starts resenting you for being a "horndog" who tries to turn everything in to sex. Even if she "gives in" and has sex with you upon demand, you'll know in the back of your mind she didnt really want to. If I ever hear the phrase "Im not really in the mood, but we can if you want to" again I'm going to go berserk.
I went through the same exact thing, only I was married for a much shorter time.
I did ask my ex after it was all over why she couldn't even kiss me or hug me near in the final months of the relationship. She just looked at me and couldn't give a good answer....and this was a woman who was never quiet with her opinions.
What I find so hilarious is that these women, once your relationship is over with them, on a very quick rebound, will start banging their new boyfriend like crazy in the beginning stages of the relationship. What? So you all of sudden like sex again? Whereas most guys will just keep that same sex drive through the entire duration of the relationship.
It's just inevitable that they'll repeat the cycle and go cold again for whatever reason with the next guy. History repeats itself over and over again.
And like you said, you do start doubting your attractiveness. I know I did until this girl I started seeing told me about how other girls in her circle thought I was really handsome. Even her guy friend said "yeah, he's a pretty good looking dude".