Kader doesn’t have too many true friends. He has his fellow Knights as well as Kylo, but he doesn’t classify them as friends.

In truth, the only one he could ever consider a friend would be @arabella-of-the-first-order due to the fact that she’s the only one he can speak with. Not to mention that they have a relationship that his father doesn’t know about. 

Mostly friends are tools, they are to be used, and then disposed of. Obviously, he has several contradictions of the idea of what a friend or friends are, but for now he doesn’t feel that he needs any.