Before u all crucify me from the title - I found out that my BEST friend was trying to get with my current girlfriend behind my back. There was a lot of drama etc etc etc, we almost fought each other and other stupid shit. Anyways, recently I sorta realized I never said anything to him about the situation after it had died down (our parents took both of our phones lol) 

So, I text him about how happy my gf and I are, how we're in love, the amazing sex, etc. I sent him about 2 paragraphs of text including the things mentioned above, and he blocked me. 

No problem to me. I don't want to talk to him anyways (unless it's belittling him.) But my GF saw my text and literally called me an asshole, verbatim. 

She said he was probably just confused and emotional at the time and made a mistake and that I shouldn't be rubbing it in his face because after all, he already lost - he didn't get the girl. 

This made me start to doubt myself, and I was like woah why am I feeling guilt for telling off this asshole? We had been best friends for 2 years straight and I told him how much I loved her well before he ever made a move. 

TL;DR - Best friend tried to get with my GF. Months later I tell him off. My GF calls me an asshole 