I'm in a serious relationship with my girlfriend. We are soon to be engaged. My soon to be fiance has a guy friend she has known for at least 5 years. Her guy friend lives in another country and they met online before we got together. He recently traveled to her country to meet her and give her christmas presents. I recently learned he calls her almost daily on the phone. I trust my girlfriend. She disclosed their friendship to me. Also, When he showed up for a surprise visit she declined to go out with him alone. What troubles me is she hasn't told him about us and she says she will once we are officially engaged. I would think if they are bff they would just naturally talk about things like that. She didn't even tell him when he showed up for the surprise visit. Any thoughts?