dear woman, I think the "I don't know" response is totally understandable.
maybe continuing with the therapist will help you with some decisions & feel better about yourself.
you do deserve much better as do your children. can things change for the better & still be married? probably many more things to consider than what you've written. just know you've been heard & believed.
please keep posting, it's good for you & we want to know if you're ok.

Take care.