Do you think your fiance should have a best friend of the opposite sex? They haven't known each other for more than 2 years. They used to work together . They also talk every day on snapchat. And the first time I ever heard of her , they were calling each other "bae" when we broke up shortly after I gave birth to our first child. That was about 2 years ago. I've never met her & they don't talk later than about 7pm . He said they don't talk about anything personal and it's always general conversation but at one point he confided in her about something I felt was personal. I'm the type of person who feels that you should never let someone of the opposite know too much about your relationship as it isn't their business. Idk though.