I had an open relationship problem a few of months ago that I haven't really thought about since, due to it turning into a serious relationship with one girl til just recently.
Anyway, at the time I was in an open relationship with one girl and she was happy(ish) that I was dating other girls too. One of the girls I was dating turned a little more serious, although I had always made it clear that it was a relaxed thing we were doing and we were just casual.
We had a night together (no sex though) and the next day we were driving along and told her I was in an open relationship (tactfully!). She went silent, stopped the car and told me to get out! She apologised later but said she didn't want anything to do with it. Where do you think I went wrong? Never sure when to bring that sort of thing up! or maybe she as just a girl that was into normal relationships??