<human>: Provide a brief overview of the text.

So long story short. My brother [23 M] and I [18 M] got into a fight and I told his GF [23 F] that he cheated on her. 
Now they sat me down and insulted me about everything I do.  my dad [44 M] and other brother [26 M] said I was in the wrong for telling her, she's still with him and she's even here right now. But they pretty much said I need to stay out of others relationships and that if my brothers Husband [27 M] was cheating I would have no business telling them!!! Am I totally in the wrong? Cheating makes me sick.. Physically ill... But I was told to mind my own business about it, like what the hell? 

Then my dad said that he's ashamed I did that. And my other brother said all I was doing was burning bridges?... Even if that's true it's true but I'm being attacked for trying help. Is it really none of my business. When I graduate I'm gone. I'll live elsewhere but until then I need to know if I'm really the issue or if I'm doing what's right but being bullied for it. 

Editing here, my dad asked what a man was and I said someone who had his word and had Honor.. In the more biblical sense. And he said no, he said it was someone who provides. So the woman providing means the husband isn't a man then?
<bot>: got told I was being the problem when I told my brothers GF he cheated on her, and was told in the only issue.