I know how you are feeling. Am w/o my boys tonight and am trying so hard to keep myself busy/ distracted.
My H also started showing more interest in spending time w the boys after he moved out. I guess he could handle them in small doses and wanted to prove to himself that he wasn't completely shutting them out of his life.
Your H relationship w your kids has NOTHING to do w his R with you. The setting has changed so he's trying to alleviate guilt. Very simply.
But, it is GOOD for the kids to have a good R w their dad, so that makes me happy for them.
M- 18 T-21 S-14,11 & 10 BD 6-18-2012 (OW-EA) H moved out 11-3-2012 10-5-13 Me- I want a divorce. I want to move on w my life. 11-25-13 Jointly filed.