I agree that being friendly to him initially in a public setting is disconcerting.
I don't agree that an other person should ever be introduced to a family with children. To do so is to put something of a stamp of approval on the other person.
Since Choc's wife, if the affair progresses, will want to introduce the other man to her children in order to "normalize" and legitimize the relationship (textbook behavior), Choc having previously introduced other man could be inadvertently limiting his legal arguments to restrict other man from access to his children (a common component of a legal separation agreement).
All the best, -NOPkins-
I will ferret out an affair at any opportunity.
-An affair is the embodiment of entitlement, fueled by resentment and lack of respect. -An infidel will remain unreachable so long as their sense of entitlement exceeds their ability to reason.