I agree with Turtle in that you have to really save yourself first. What have you done wrong in the M? Who do you want to be? Where did you get lost? Most of the time, this is a serious undertaking figuring these things out and addressing them.
Outside of that, I agree with chatter in that you want to disable the A as it relates to your relationship with W. In other words, I wouldn't watch your S so she can date. Figure it out in a balanced way.
What's the details? Kids? Who moved? Anyone filed? How are financials?
All in all, there is no magic pill, or magic wand. It's a crappy situation that takes time to work thru. Sometimes it results in R of the M....sometimes not. But, if you DB, you will at least save yourself.
