why doesnt my husband ever want to have sex?

[Megan]

whats wrong with him? it seems like since we got married he rarely wants to have sex. It really bothers me because i enjoy having sex and we have sex maybe once a week now and its not even enjoyable for me most of the time because its right before i go to bed and im half asleep that he trys anything. I ask him about it and he'll always say not tonight, im tired" we can do it tommorrw night and the next night will come and he still wont want to have sex. He rarely shows me any affection either; I enjoy having sex and i am starting to feel like i made a mistake marrying someone who doesnt... what is wrong with him and why do you think he never wants to have sex with me anymore