Sorry,, been there done that got the teeshirt. (thou in my case no kids involved)

There's been good advice given so far.

Best advice has been from RICH !!   Listen to him,,, Say NOTHING !! least on here,,

I hope this fiasco is as painless as possible.  Always be the Gentleman regardless of what she may say or do.  Your kids are the most important issue, but don't use them or allow them to be used for 'leverage' etc..    That's lower than whale snit..

I do wish you the very best