For one thing, stop contacting with her. Only consult about kid stuff if there is absolutely no way around it. Don't use the kids as an excuse to contact her.
Stop being available to her. Instead of being there whenever she needs you, have your calendar full. Don't respond to statements like, "I miss you". Let her calls go to voice mail. Don't respond to TM unless she asks something necessary regarding kids. Learn to use two or three word sentences when you do have to answer her.
Be mysterious about your GAL. Go out with other people. Don't be at your house your "normal" times.
A WAW doesn't want a "best friend" in her LBH. At least, not right now. You're too eager to be her unconditional friend! The more you are around her, the more you push her away. That's why you need to leave her alone.
She will start to want you when she thinks you are no longer interested in her.
Don't tell her that you'll do whatever she decides about the MR. You are trying too hard to be agreeable to whatever she says. That's a turn-off.
Don't go with her to pick out new houses, or things to go in her new house.
Detach......and then detach some more.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!