My boyfriend re added an ex on Facebook after about 4 years after their mutual breakup. She is now married. They have mutual friends but I still don't think that makes it okay especially since there relationship was serious. I think if he were already friends with her, it would be a different story and I wouldn't have an issue with it. But this is a situation where they broke up, had zero contact for years and then suddenly one of them decides it's okay to become friends on social media. Even if it is a harmless add, isn't it inappropriate?