Do you thinks its right when your bf gets mad when u don't want to tell him something u don't want him to know?

so i was talking to my friend about some problem i had.Then when i was leaving i told him not to tell any one. He said ok then my bf went up to my friend and aks what we were talking about. He told that i didn't wont no one to find out about. so he got so mad and told my then why did she tell u. Then he said because she was asking if it was dumb or not