She is married with children and so is her work colleague but he has a massive crush on her and I think she has feelings for him too (though nothing has happened). She swears she would not have an affair but, if he did leave his wife for her, I’m wondering if he would just do the same thing again (she thinks not as she has known him for many years and he doesn’t have form).
Should I just not interfere or should I try to warn her off?