My LTR with whom I'm living together is going out to training with a male guy after work. She used to say he is a personal trainer, after a while she told me that he is indeed her friend and she is not paying him for services (apparently he teaches her swimming and how to train at gym). She also told me that he is a gay so I have nothing to worry about. I've tried to be funny and said to her while we had beer that she should tell me his name so I can check how ripped he is (bad move, I know, but I was a bit drunk). She said that she wont tell me anything beside his first name. She told me she dont see him at all beside gym. We had a fight, won't speaking to each other since yesterday. Today she told me in morning that she is sorry that she dont tell me his name, that she dont want to fight, but she won't tell me his name as she wants some privacy and she will be making decisions on her own and I need to deal with it, then she walked away. Dont know how to proceed. We agreed some time ago we tell each other when we meet up with people of opossite sex, and so far I knew each guy she was with alone. I know I shouldn't feel insecure, but I just feel disrespected.