Hi , hope it's ok to add my pennies worth. You don't know what he's thinking , he could have been thinking about reconciling or he could have been relieving his guilt , either way you can only carry on with your life If he wants to reconcile then you will know If he's trying to justify his guilt then that too will become apparent
The detaching is very hard and that's why you have to act it until you really feel it
This is such a hard thing to do but like anything , practice and it does get easier
