You don't lose friends because real friends can never be lost. You lose people masquerading as friends and you're BETTER FOR IT. I don't believe in friends., only acquaintances. Most People don't know what a real friend is.
Try not to stress over the shady people who betrayed you. I know it hurts, but the truth is that they were always shady, they're never going to change, and you're actually much better off now because at least you know who they really are. (For my friend)