Have you ever been betrayed by a close friend?

Two people come to mind. One was my very best friend for several years. We were always texting, talking on the phone and hanging out, and one day he quit talking to me. I have no clue why. Same with another good friend who was a guy, only in that case I think it was because he was in love with me and I was not interested at all and had to keep turning him away. He finally blocked me. I'm so hurt by those two friends that I no longer allow myself to get close to anyone at all. I prefer to be alone now- can't get hurt that way.