Hypothetical situation at the moment, but my friend and her ex split, at his instigation, in May this year. She has since met someone else and things seem to be going well with the new bloke. That said, I think she still has feelings for her ex, they were together for three years.
I've always had a soft spot for her ex and increasingly I get the impression the feeling is mutual. I am not going to do anything about it out of respect for my friend, but at what point (if ever) is it OK to date a friend's ex?