Is it normal that my colleague told the conversation of me n him to the boss?

I dun talk much with my colleagues from the office. Whatever I said, I take control, because I don't wanna get annoyed by anyone. I have one colleague, who is quite friendly and quite talkative. One day, I was talking him that I can get stress easily . I also told him that I m so scared of the bosses , I get stressed when they are around me. I was talking it as part of the conversation and I warned him not to tell about it to the boss . Yesterday, that guy told about it to the boss. I think it's not good and I m quite upset with his behavior. is it normal that he talk our conversation to the boss?