He won't touch me

I've been with my husband for 20 yrs, married for almost 18 yrs. I'm 37 and he's 40. We've always had a good sex life until a couple of years ago. He was always very loving and now he won't come near me, no hugs, kisses no sex for over a year. He even sleeps on the couch every night. I have begged him to show me some affection and all he says is I'm not in the mood. I've sat him down & talked to him about it & he says nothing at all. I'm so confused. He makes me feel like there's something wrong with me.

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