My husband don't want ...I am 21.?

I don't understand...we are together 2 years.No kids.He is 27...i am so unhappy.We use to do it every second day.Now is once a mount if i beg for it.I am so confused.He is not cheating but the is on everytime he have a chance.I don't know what to do.he sad I am atractive.But he don't want me....Dont want to sound stupid,but i know i am y.So why????I can't sleep any more.He don't want to talk about it...i love him so so so much and don't want to cheat on him but that make me so sad.It's been like this for an year.It was my job-its not my job.it was his job-its not his job.it was too much drinkin-now its not.Everytime he have an excuse.I need help.he wont go to therapy,i can't fight any more.i can't cry no more.i want to be happy.I am a good girl-good wife.Suportive,always with a smile,try to keep home clean,try to cook....He just don't care.What is his problem and how can i help.we was talking about baby.I am not sure any more.I am foling out of love of the man of my dreams.