I went through the same for 25 years. I fought to save our marriage for the sake of our children. But the bottom line is, you can't make someone love you. Eventually, he fell seriously in love with someone. They got married. I think they are happy. But the hurt lingers on. My children, who are married, think I have done well and coping. Little do they know!!My culture and religion prevent me, from forming another relationship.
In your case Juneb, he probably does love you, he is still with you, and as you say, he may be on the autistic spectrum. That's not an excuse, but probably a reason. Whatever you decide, I wish you luck and all good wishes !!!