the videos of him "crying" are just a manipulation to get you back so he can control you.
I wouldn't worry about telling your mutual friends why you left him. I found it interesting that none of our friends asked me why I filed for divorce, and the one time I tried to bring it up with one of the girls, I was shut down pretty hard. Which was right, don't put your friends in the middle.
If you see him, just keep walking. Don't engage, don't let. him draw you into a conversation/discussion. Stay firm and consistent that you do not wish to speak with him.