boyfriend not trusting me

My boyfriend keeps say He don't believe that a girl can only talk to one guy and We been dating for almost a year I only talk and text  he has all my passwords is that his way of saying it wants out the relationship  and sometimes he  always get mad when I tell him how my day. Was at the and if a guy was trying to talk to me at school  and I tell he we always end up inargument before we go to sleep what am I doing wrong help !