My ex could have been your good friend.
When the children were born and very little, he really wanted me to be at home with them, doing all of the relentless daily grind that comes with having small children, because his career was taking off (we were in similar roles) and really, two of us couldn’t be pushing our careers, working the hours and the way he worked, and I agreed.
So I went part time, stalled my career and took over almost everything at home to make his life as easy as possible.
Lo and behold, 15 years later, when the kids were older teenagers, life was getting so much easier, all the shitwork was done, mostly by me, he decided I needed to step up, try and move on in my career and earn more so that he could reduce his hours, play more golf, go on more ski holidays with his friends, and get more of a work life balance. And he moaned about this to anyone that would listen, but didn’t give them the back story.
So I’d be very careful of listening and sympathising too much with your good friend unless you are in their relationship and know the history.