I still feel that I cannot leave. My child will never forgive me if my husband commits suicide. My guilt would be unbearable
You are thinking about this all wrong. Please understand, your current viewpoint is not a good way to look at your situation at all.
You cannot make someone commit suicide, if you make someone die, it's murder. You cannot have murdered someone who has committed suicide.
You cannot be responsible if he commits suicide, committing suicide is entirely his choice and whatever you do, the decision to do it remains his alone. It's his choice.
He is emotionally blackmailing you to the point you cannot think straight.Emotional blackmail is not an autistic behavior, nor is coercive control, they are both abusive behaviour.
Please do some reading, firstly about autistic behaviour and very importantly about abusive behaviour. It will help you immensely if you can understand the difference between the two.
And it will ALL BE MY FAULT.
No, no, a thousand times NO! It really will not be your fault. If he chooses - and he really does have the choice - not to microwave lovely homemade food for himself but to eat crisps and stay in another room and get cold, then it's HIS CHOICE to do that.
By doing those things, he is choosing to make himself miserable, there is no way on this planet that his poor choices are somehow your fault.
You are not stuck between a rock and a hard place, you have options, only you are so abused and downtrodden you have a skewed view of your circumstances and cannot see there are different choices that you can make for yourself and your daughter.
I hope you can see through his abusive behaviour and find some solutions which suit you. I reiterate, autism and abuse are very different.