Like, maybe in the moment he was just too mad/ hot state to get around to the apology. Then, separately, later he realized that he could actually get in trouble for this and wants to cover his butt.
Odessitka, have you had any communication with the wife/mom?
I have been e-mailing with his wife every day since the incident. She remains in shock, but from what I could gather, they haven't really discussed this. They don't talk to each other much normally. If they have an argument, they use silence treatment for a couple days, and then everything's back to normal. Works for them. Anyway, as I realized, he has no intentions to apologize.
Also, if you've been wondering, my husband and I will remain friends with her, and since our 8-year-old daughters are best friends, we'll make sure they don't suffer from the consequences and see each other on a regular basis, like they used to.