Depressed & confused

I have been so unhappy lately, my husband stays mad at me because i forget everything and acts like he hates me. He has been looking on dating and sex sites alot, signing up on adult friend finder etc. When i say something about it he gets mad and  says its innocent, he also said he was "sorry but I just didnt do it for him because I'm pregnant and my pot belly turns him off"... is this happening to anyone else?