Letting go of all that frustration towards MIL seems a good step both towards moving on as a single mom OR someday reconciling. What a total 180 that would be, am I right?
I'm sorry you're going through this. I was a WAH in my marriage and get your point about how hard it can be with an unsupportive spouse. I was the primary caregiver and breadwinner. I can't answer whether you should ultimately reconcile or move on, but Disney tells us to do the right next thing.
