I am glad you enjoyed yourself. Things have a funny way of working out.
This warrants an eye roll from me:
And yes, he does go through hell trying to maintain both relationships. I understand that.
You know how people say, "Rich people problems?" This qualifies as, "Poly people problems." I would have given him a side eye that would have made him feel my retinas burning his face. This would not be for me to understand. People go through hell by choice. He has made the choice to maintain both relationships, so he should suck it up, cope, deal with it, work on his shit, do something different, or read a self-help book. That is the [one-size fits all] advice to mono people, but I am using it on him.
Other than that, I do hope you have a good weekend.