Discussion on answer by Lilienthal: I've killed my colleagues' characters during RPG session, now they won't talk to me

Killing off your party is just slightly less socially acceptable than peeing in a punch bowl at a party

@DoritoStyle I also think the OP deliberately ruined the game. Of course the problem was that they weren't all on the same page about PvP and chaotic evil characters (apparently it was OK for the DM?). The point where the OP screwed up was not asking the others in advance if PvP was OK. He just assumed and he assumed wrong; he's now shown them that in cooperative games he's that guy who takes advantage of the others - and they have to go on "playing a cooperative game" with him every day .

I can't understand why youd allow someone to play a chaotic evil charcter if you werent cognisant of the fact that they could betray the party

Why do people play games if they aren't prepared to accept the outcome of the game? Surely the point of board games is to win - no one enjoys losing, I feel for OP here. If people care more about the outcome of a board game than the friendship itself I wouldn't want to be friends with them anyway.

OP is acting chaotic stupid and wondering why there are consequences.

@Sid - understanding that this was a screw up and the extent of it (or lack there of) will help him approach repairing the relationship, therefore completely valid.

"deliberately ruined" is WAY too presumptive here Lilienthal. The existence of Chaotic Evil characters and their danger to your party is well established in these games and your answer is, IMO, far too presumptive and harsh.