i need your opinion

guys be honest, if your partner cheated on you would you like someone to tell you?

:<<<

ok, one of my friends gave my number to a guy, the guy messaged me and we started chatting, so far so good right?

well, a short time later I found the guy's Instagram account (at that point I still hadn't asked him for it

and well, apparently he had a girlfriend.

I felt bad, and I thought maybe it was okay to tell the girl that her boyfriend was cheating on her, I KNOW maybe it wasn't my business if they were cheating or not, but god, that's so unfair.

 well, I told her and she called me nosy, I ask myself something like "what do you want to get out of this?"

uh... sorry :*(

I just told him that what he was doing to her didn't seem fair and well... it didn't go well, maybe I was wrong, but I need a second opinion.

I told my mom and she told me there was no need to tell her, she even called me a drag bitch.

That is indeed the reason why I'm posting this, what my mom said really affected me, I'd like to know what you guys think