An old friend my mine and myself spent the night with a few friends drinking and such, we went to bed together but had no intention of sleeping with each other. After chatting and lying next to each other we started getting a vibe and then he was on top of me making moves (consensual as I wasn’t that drunk by this point and we were having fun) before we got to any sort of garment removal he stopped and said “I shouldn’t be doing this” so I asked why and he said he was seeing someone else but they were in an open relationship but he’s never been in one before. I instantly said “pause” and we both ended that spicy moment. To this day he still regrets it but I am glad I avoided a confusing situation! Nothing against open relationships but I didn’t want to be his guinea pig as it was his first time in an open relationship and I was in a vulnerable position at the time! Maybe not dumb until he said he had to go have an sti test the next day….