You keep right on being the terrific guy you are...keep being UPBEAT, cordial and friendly.
You can be MR. Perfect and still maintain your boundaries. The LAST thing you want to become is a doormat. You are NOT her fall back child care so that she can play house or whatever with her OM or gal pals for that matter.
Stick to the childcare arrangements that you two set and don't pick up the slack so she can "Sleep" (I mean really, boo hoo).
Her 'nastiness' I'm sure ONLY comes out when she fails to push your buttons or get what she wants from you. It pisses her off that you're no longer falling to your knees begging her to come back to you. It also pisses her off to see that you DO have some backbone and self respect because that means she is losing her grip on controlling YOUR life and happiness while she is 'finding herself' at yours and your daughter's expense.
Just keep being Wood the nice guy while at the same time letting her know that YOU also have a life and she will have to take FULL responsibility for hers.
If seeing her 4 times a week is keeping you emotionally off balance, change the arrangement to suit yourself while you get YOUR life back in order.
