Jefe, I'm sorry to see you go through this. I too have gotten the whole "I wanna see other people" line. It [censored]! I have a hard time detaching as well. All you can do now is do for yourself and the kids, if W wants to be a part of it, she has to decide that on her own.
It's funny, I give you this advice, but I have a hard time follwing it in my sitch.
ME: 29 / W: 29 M: 10 (11 in March 2015) BD (ILYBNILWY): 07/26/14 S:12 / S: 7 "We need to separate" : 08/31/14 Wants to see others: 10/11/14 Separation looming