DH has a friend who he's known since childhood. I've been with DH for 20 years, so have known this friend all that time. He met a girl who I instantly clicked with, and we became firm friends. They married but he's a dick and eventually (better late than never) they split. At the time, he wanted me to take his side and dump my friend. He was very put out that I took her side (I'd been listening to and supporting her for many years, and was glad that she'd finally had the courage to ditch him!) so things have been frosty between us since then. My DH keeps in touch with him, I've only seen him a handful of times in company and didn't get into any real conversation with him.
For the past year he's been seeing someone and on a few occasions he's said to my DH that we should all go out together (like a foursome, like we did years ago when he was married to my friend) DH did say it to me a couple of times and I explained that it would be very uncomfortable for me so no, I don't want to. DH has now said that his friend has asked again and he feels really bad saying no at this stage, and that he thinks we should go out with them.
We both work fulltime and my DH works weekends a lot so we hardly ever go out. I don't want to waste a rare night out with people that I really don't want to be with. I'm sure the new girlfriend is lovely but she's not really my problem, my problem is her dickhead boyfriend. Am I being unreasonable?