OP, First of all,
You say you have a child with Asperger's? My youngest DS was diagnosed with it. One of the things I learned is that it is hereditary. I'm convinced my older brother had it (died in 1985) but back then information wasn't as available as it is now.
The reason for me bringing it up is that maybe your husband has it and it was never diagnosed. If he does have it he could love you very much but is unable to express it, verbally.TC
Oh, great...add another guilt dimension to this story. I doesn't matter completely what "problem" he may or may not have. You are not responsible for that problem. Everyone seems to forget that there are two partners in a marriage. Both have an equal right to be happy and feel important. No one individual has a right to be the complete center of attention.
Let me qualify that by saying that there is a huge difference between having a spouse take ill after time. No one would respect themselves if they walked out on a person in need. This, if true, is a surprise package that came with a hastily required union that, from the way she speaks, was passionate, in the beginning, but not really "Love" filled.
I was married for 29 years to someone that I thought I loved and equally important, I thought loved me. It was not the case, I was to find out. I was apparently the donator enabling her to have children. As soon as the last one was married...she was gone. I wouldn't lie and say that none of those years were good, some were, but when it was bad it was awful. I had the mistaken impression that I needed to stay the course because she was mentally ill and I couldn't walk out. She solved the problem by leaving me a three word note on the counter top. It read "I have left". That was it, 29 years and all I got was "I have left".
I found out later that I was "holding her back" (bare in mind that she was 60 by then) and that she "never should have married someone she didn't love". No, if two people are that unhappy there is no reason to "hold it together". It just causes more pain, a life wasted and no happiness.
Since my divorce...my life has been so much happier, productive and worth living. I guess I was relieved when she finally did go. It freed me of guilt and let me move on.
I don't have anything against therapy...but I think it's long term effectiveness is shaky at best. Give it a try, if you feel that it is worth the effort, if not...move on.