No sex drive

Mr

Guys, when my husband and I first got together it was constant sex. I was so up for it all the time. Now I never want to. I never masturbate, nothing. I don't feel any urge, I actually hope everyday in my head he doesn't ask for it. I don't say no when he asks because I don't want him to feel unloved. I know it sounds terrible, but I don't know what's wrong with me! Any ideas?