I was out with a GF in Wanchai one day, and a WG I'd been talking to in a bar came walking towards us on the street - the GF noticed our eye contact and asked if I knew her.
No issue, she was cool about it, our relationship was an open one.
Was a few years ago though so I was younger and more "eligible" ...
... reminds me of that ad for deodorant, where a succession of different girls walk up to the camera (as if it was their SO) being angry at first and then becoming sexy ... lol ...