Thanks for your comments Mozza, just wanted to address a couple points...
We don't have a schedule for the kids. The problem was when W first moved into her condo about 2-3 mos ago, the kids didn't want to go over there during the week so she would usually take them on the weekends. I was fine with that because it allowed me to GAL with friends on a Fri/Sat night. Lately, they've been more comfortable staying there during the week, so it is time that we create a set schedule.
I realized after my NYE invite was declined that I can't recall a single invite W has extended to me, despite her claims that she wants to work on our friendship. So I'm done extending them.
By no means did I mean to imply DBing is for pushovers.... I just finished writing a long excuse for my actions, but then deleted it because I do recognize that I need to work on my controlling actions. Point taken.