A guy I've known since I was 11.
He was the kind of guy who was nice to your face but talks about you behind your back. He would also ignore you whenever he got into a relationship and if you got on with his girlfriends better than he did, get jealous and bullshit about you so she won't talk to you.
One confirmed thing he said about me was that I was a "sexual pervert" and I didn't hear from either of them for a year and a half. The only reason I did hear from them again was because she was visiting him, got drunk at his friend's party, they went out and she banged on my door. It was at that point I found out their relationship was on the rocks and he openly confessed to me that he wanted to cheat on her. I took her to his (where she apologised for ignoring me because she believed every negative thing he said about me) while he tried - and failed - to get his end in at his friend's party. Apparently the girl he was after did get fucked, but not by him. Dat face of utter jealousy was priceless.
But I digress.
The final straw was when he ignored me for the fourth time because he got into a relationship with an ex of mine which lasted 2 years. 2 years of torture for me, because I still liked her. And he tried every way he could to stop me speaking to her by trying to claim I was all sorts, which worked for a little while because they ganged up on me on EVE online wherever I went and whatever I did, so I left the guild/clan/thingymajooly (you can/could Teamkill if you're in the same clan as them) and quit.
I'll admit I wasn't exactly a saint; I did try and break them up a few times. But an ex I still had feelings for getting together with someone I thought was a friend broke me.
Eventually I stopped speaking to them for a while for the sake of my sanity. It helped. By the time I began speaking to her again they'd long since broken up and I'd gotten over her. I gave him the opportunity for us to talk it out. He didn't respond, so I finally told him what I thought of him and cut ties.
After 3, nearly 4 years, this pretty much sums it up:
Odamust wrote...
OT: Got no one to spread my rage on. All that built-up rage got lost in the process of storing.
The entire experience left me hating people and becoming a shut-in for 2 years.
TL;DR - A guy I know who treated me like shit.