Boyfriend tired of sex

Ashley • Due Date November 16, 2015
My bf and I used to have sex every other day. Now we barely have sex at all anymore and it really seems like he isn't interested in me or nothing it's making me wonder if he's cheating. Any ideas. I already tried talking to him and he don't want to talk about it and he says he's not tired of our sex or me which I think he's lieing about