One of my oldest friends spends her summer holiday with her family every year in a resort near where I live so we always meet up a few times for a swim, lunch etc. Since I met my DH, we all meet up together but it's very much her and I who are the friends but our partners get along OK.
A couple of years ago her DH left her for another woman he'd been having an affair with. It got very messy, as you can imagine with 2 children involved but after a few months, they got back together again. I stuck by her through it all and have always remained civil with her DH. She chose to forgive him so I will back her up in that choice. My DH however, won't. The last time they came over, I had to make lame excuses as to why he couldn't come to meet up with them.
They will be coming again at the end of August. Is DH BU to not want to go when he really enjoyed it previously and should he just accept that, as a couple they have made their peace with the situation? He says he can't make polite conversation with him now knowing what he did to my friend and her family.