Do you know for a fact that the OM was there? You just mentioned that he's in the same group of friends. It's kind of hard to enforce anything if you don't know for sure.
I totally understand how upset you are. Remember my W worked with her OM for two years after we separated. I understand you don't want your children around him too, but there comes a time when you are going to have to trust your W and in God. I didn't know if my W were taking my kids to her working place or hanging out with him. I had to give that part up to faith and that one day she would see what a POS this guy was.
And lo and behold, the guy tries to get me fired. Of course my W was planning his going away party at the same time, but it shows what kind of fog they really are in. But I still leave it up to faith that it will work out.
When you do the RO, it will cause more waves. Do you think it's worth it? If so, then do it. Or clarify the boundary that you have again.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.