Unfortunate is he who cannot gain a few sincere friends during his life and more unfortunate is the one who has gained them and then lost them (through his deeds).
Holding anger is a poison. It eats you from the inside. We think that hating is a weapon that attacks the person who harmed us. But hatred is a curved blade. And the harm we do, we do to ourselves.
"Our life is what our thoughts make it. A man will find that as he alters his thoughts toward things and other people, things and other people will alter towards him."
James Allen