I can imagine the roller coaster of emotions you must be feeling right now. Divorces take months and your H is still very hurt and angry. The best thing is for you to stick to DR and follow everything written in it.
I would say it's a positive sign that your H isn't filing for divorce but separation. It sounds like to me he may want to save the M but doesn't want to spend his money on your affair. I know you ended it but it might be his perception that you are still in it.
Ignoring the kids is not good but he's probably doing it to avoid contact with you which would hurt. Most men are devastated by the thought of their wife with another man. It destroys their own self-esteem.
Me: 44 H: 48 M: 4 yrs My EA: 2010 & 2012 Me arrested for DV: 10/28/11 H left 1st time: 10/28/11 Reconciled after I pursued: 12/21/11 H left 2nd time: 12/23/12 Kids from OR: S16, S10, S8