Awww favourite, dont feel alone. I see the good in wolf's advice. I still do believe that he needs sexual gratification from a bloke because he has strong feelings towards men. If you do your research you will find it is never the case that a man is 50% inclined to both sexes - hence my opinion he is very much inclined towards men.
As for gay men not being able to have sex with women, that is utter garbage. I can say this with confidence because first off, I have a close friend who is gay and because he is asian, he will never come out. Now he has admitted this to me and secondly, I have far too many posts from gay men expressing that they have all along been gay but called themselves bisexual for the most part of their lives and even got married as they could not accept they were gay. They have stated that as long as they are stimulated in the right way, it is possible to have sex with a woman.
That aside, I still think your husband loves you dearly (emotionally) which is why he is so upset at the thought of you ever leaving. I also think decisions like these can make many people feel lost, alone and even suicidal. Be supportive of him and what he is. I know you already are. But also be true to yourself. x