What does it mean when your ex gives you updates of his life with his fiancŽe to you

Me and my boyfriend was in relationship for 3 years. Then suddenly he said that he doesn't want to marry me but still wants to be friends. I accepted and we continued to be friends. And on another day he disclosed about his girlfriend with whom he was dating simultaneously when we were dating now is going to marry her. I continued talking to him for 4 months after he declared this to me. Then I stopped because he was showing interest in getting physical with me without the knoweldge of his fiancŽe and without even leaving her. Now whenever something happens in his life like his engagemnent or something important related to this he comes to me and tell me the same. He says that he still want to be friend with me. I am not understanding this I still love him and his updates about these things make me hurt. Personally I want him back for life but I don't see this possible. I don't know what I should do in this regard? Please help