Help find: hotel, group, bf n gf, humiliation?

I think this is ntr. Please help me find manga.

Bf met gf at a hotel. I think they were long distance dating for a while.

At hotel, bf was forced to watch gf gangbang. They started taking turns at the bed and then moved to the ceil to ceil windows. The leader of the group was narrating how gf got into that situation. Can’t recall what he said but he concluded that gf chose sex over love.

I think the bf just watched n felt all bad. I don’t recall him participating.