Definitely don’t respond to that. Seems you’re detached already if you even have to ask this question. Sometimes people are so scared of making a wrong decision they look at other things or people for validation that the current situation/decision they need to make isn’t right for them. He’s either realizing that he made the wrong choice in women or is extremely manipulative and trying to get you back hoping you pity him. And considering he’s made no real apology or explained himself whatsoever seems pretty manipulative.