Help !!!

OK soooo I've been with my husband for 3 years now & at 1st the sex was great (it still is) BUT I don't cum like I used to.. He always finishes & I don't ! Sometimes I get completely dry or turned off rite in the middle of having sex. He says he feels bad & blah blah blah BUT he won't even play with me to at least help me finish (since he knows it hurts me to get soo close to finishing & NOTHING). . What is wrong with me ? Is this even normal ??