It doesn't matter.
Either you choose to continue the separation to divorce, or you choose to get back together with him. Either way, don't expect an apology. It's not about whether he's apologetic or not, it's about whether you are able to leave it behind you or not.
If he's truly in recovery, he will be guilt-ridden and it will show in his actions. If he's not (like with my AXH), his words of apology will mean nothing.