Shiss - Don't try to wrap your mind around his behaviour because it does YOU no good. He's probably scared and confused as much or more than you. Don't think that just because he's making these decisions that he really knows what he wants....he probably doesn't, but if you focus on yourself and make changes you think you need for YOU and not the relationship that will help. If he sees these as positive and attractive, he might turn around, but if he doesn't YOU are in a better place.
One day at a time..... One of the things that has helped me is to learn that your feelings are your feelings, but it is how you react to them that makes all the difference. I was in your shoes not being able to comprehend any of this and I kept trying to make sense....but I changed my perspective because I realized I had lost my wife the way we were and being sad/angry/lifeless because of my sitch would do me no good and DEFINITELY no good for any chance at reconciliation. Once I let that go, things have been better.
Please note that I saw tons of people write about this, but it took some time for me to accept it and use it. Again, one day at a time.....
Me 42, Wife 39; Married 16; Together 17; Kids: D13, S10 Wife asks for Divorce: 03/19/13 Reconcile: 07/07/13 Round 2 Starts: 02/19/17 Apartment Life: 04/21/17 PA Confirmed: 05/23/17