I am curious to see how he responds. It will give me some cues on whether I believe he is capable of understanding others' feelings.
Why would that matter to you if you guys aren't reconciling?
B, you could sit him down and tell him how badly he treated you and he might even feel guilty about it and if he's mature enough he might express regret ... but at the end of the day you are just giving him more information about you than he knows what to do with.
My experience has been that my xH knows he behaved appaulingly - he's blocked out the things that hurt me the most (they don't remember the bad stuff so his recollection of things is going to be different to yours and that will breed conflict)- but what my X does remember brings him deep shame.
One of the ways we "let go" is to understand that they'll come to reflect on how they've behaved in their own time in their own journey and that's the most powerful place for it to happen - it's not necessarily up to us to spell it out for them - like it's not up to us to mother them in any other ways.
Do it if you think it will make you feel better - but beware that in doing so you give him another bit of information about you that he may not have the right to own.
You are doing great. I do know how hard this part of the trip is and you are really keeping up.
Take care, V
V
Never make someone a priority, who makes you an option.
