To inject a humorous angle on this I'll reference Richard Herring
(Here's the bit, the first 1:15)
"I chose to live my life by the motto 'My enemy's enemy is my friend.' Unfortunately, as it turns out, my enemy is his own worst enemy. So I have to invite him to barbecues and stuff. It's quite annoying because I don't really like him.
"It's doubly annoying because he lives his life by the motto, 'Keep your friends close but keep your enemies closer.' I'm just helping him out there; it's an annoyance."