My partner and I have only been together for just over 12 months. When things got serious between us I ceased all communication with other men I was chatting to and I assumed he did the same.
I have since found out that he is still regularly communicating with a women, who he has known for years. She is in an unhappy marriage and is constantly messaging him about how she wants to run away with him, about how happy they could be together, etc. etc. He has not at any point (from what I have seen/read) acknowledged these advancements apart from saying he is sorry she is unhappy.
I have spoken to him about it and said I am happy for him to have her as a friend but he needs to tell her he is in a committed relationship and not interested in anything other than friendship with her.
A month later I have found out he has not told her this and she is still messaging him. Why won't he tell her? I have now basically just said all communications have to cease between them, but I feel guilty for giving him an ultimatum when they have been friends for a long time.
I don't want to seem like the badie but my self confidence and self esteem have taken a battering in the past in previous relationships where I have been cheated on emotionally and physically. I don't want to end this relationship but trust is a major factor to me and I don't want to have to keep feeling I need to check his phone to see if she is messaging him and if he is replying.
How can I make him understand how I feel and that it is not acceptable for her to keep sending him these messages and for him not to tell her about me?