Have you ever had a really *good friend* suddenly turn on you like poisonous snake for no reason what so ever?

Never a friend but a crazy ex contact. He/she starts rumors, trouble and acts like a 13 y/o girl. This person is addicted to gossip and is NUTS..............Too crazy for me. He/she turned on me because I busted him/her and told him/her so. I guess the truth hurts............LOL