Doesn't it just suck when we get removed as a friend or unfollowed on social media accounts for "absolutely no reason"? (Facebook, Instagram, Snapchat, etc.) Even if we just became friends a week ago or we've been friends for years, this just doesn't make any sense to me.
I understand that I've asked questions similar to this, but we may never know the reason why people do this: Is it because they lose interest? Are those people really your "real" friends? Most people just tell me to "let it go", which I do, but still, I'd never do this to anyone unless if I don't know the person at all or if something split up our friendship.
So, I quit letting this bother me because it's their loss. You had the chance to remain friends with me, but you didn't.