I agree with you Tim. If you file for custody, that might be the final nail in the coffin for the M.

IMO (and this is just me), I think you need to back off and not make any sudden moves.

Now, in the meantime, she says "Dealing with your behavior and the way you treat me is too much"

^^^ What does that mean for her? I'm not saying it's true, but can you understand why she might feel this way? If you were to put yourself in her shoes, can you see why should might feel this way?

What can you do right now to start 180'ing this?