Husband who dose not care about our son and son who sense getting home from the hospital is steadily losing..?

My son is 14 years old and he has never really had a high opinion of himself and his self esteem has always been extremely low. And we are still not really sure why he attempted suicide, in the first place the doctors think he may have manic depression. But he just got home because he was in the psychiatric ward and the hospital all for about 3 weeks or so. And well i will admit i have been smothering my son in love sense he got home, but i am also mad at my son that he did not come to me or my husband for help. And that bring me to my other problem my husband his dad acts like this is no big deal and that we should just go on with life like normal. And he told me that it dose not matter what we do our son is hopeless and that shocked me like i am not sure. I wanted to cry so bad, i am not sure what to do. And well ever sense my son has gotten home from the hospital. He has been steadily losing weight he wont tell me how much he weighs. But i have noticed it because when he got home he did not have a six pack or what not. And when myself and my two son's went swimming yesterday i could see his ribs. And when i mentioned it he got out of the pool and went to his room and when i followed he was sobbing. I am not sure what to do, anything i say to him seems to be wrong. He is seeing a psychiatrist as well as a therapist.