You lost friends that you needed losing
Friendships are the weirdest of relationships. Some of them may be life-changing or even life-saving, others turn sour. I've had some of both, I learnt from both. You learn from the bright friends and from the negative ones who are always grumpy, you learn from those gossipy ones and also from the introverts. You manage to appreciate the insecure friends who are always questioning their qualities and also those other diva ones who know it best and know it all!