How about a year ago a guy spoiled infinity war for me? So, I befriended him, lied to him, and gained his trust for a full year. Then I spoiled endgame for him.
Why did you feel that you had to spoil endgame for him?
Because he spoiled infinity war for me, so I wanted to get back at him
That's an awful lot of effort placed into a small amount of revenge. Was all that work for revenge really worth it?
Yeah. :)
Befriending someone just to get revenge is wrong and makes you untrustworthy.