She told her husband that she would divorce him if he didn’t stop acting like he was married to his mother.
When he heard this, he began crying and vowed to change.
OP was hopeful but knew she needed to talk to her MIL, who only told her she would never win.
The Redditor clarified that there was no winning and losing and that if her MIL continued to act as she was, she would not have access to her grandchild.
She confirmed that her husband had also stepped up since her conversation with him.