I always switch back and forth between friends. Any tips?

I was very close to my friend A. Everyday after school, I would hang out with her.Then just last year, I met friend B and I stuck with her like glue. Everyday after school, I would go to friend b's house instead and leave my friend A. Recently, my friend B told a school official that I tried to take my life. I got really mad because she totally betrayed our trust. I understand that she was only doing it because she cared..but there's always that sense of betrayal. I forgive her now, but I feel uncomfortable around her now because during my depression mode, she was overwhelmingly caring(this scared me). Now I'm back to Friend A..and I just hate how I stick with one person for some time then I switch to another person, then I go back to the previous person. Before this all happened, I would talk to friend B every night for hours. We've become very distant and don't share feelings anymore.I rarely call her anymore n if she calls I either ignore the call or we have many silent moments