When the only bond between close friends is attachment, then even a minor issue may cause one's projections to change. As soon as our projections change, the attachment disappears, because that attachment was based solely on projection and expectation. It is possible to have compassion without attachment, and similarly, to have anger without hatred.
It is easy enough to be friendly to one's friends. But to befriend the one who regards himself as your enemy is the quintessence of true religion. The other is mere business.
If friends disappoint you over and over, that's in large part your own fault. Once someone has shown a tendency to be self-centered, you need to recognize that and take care of yourself; people aren't going to change simply because you want them to.
"I should hope so," Laigle replied, "for my coat and I live comfortably together. It has assumed all my wrinkles, does not hurt me anywhere, has moulded itself on my deformities, and is complacent to all my movements, and 1 only feel its presence because it keeps me warm."
As long as you are lucky, you will have many friends; if cloudy times appear, you will be alone. -Donec eris felix, multos numerabis amicos; tempora si fuerint nubila, solus eris