Well me and my gf are mad?

Well my girlfriend and I got into an argument becuase I got mad becuase she send me some pictures from her email that was a link attached from facebook and it was her ex boyfriend and he's a gangster and I'm a prep boy and like Im like kinda getting mad becuase I know that she said she will never go back to him but it hurts me a bit inside that she That she send them to me I feel like it's my fault that I started it what should I do and no stupid awnsers like break up with her becuase this is our first argument in months!