How to get over being betrayed and how to start trusting again?

CheckPlease
Long story short I was betrayed, stabbed in the back, and emotionally blackmailed by 3 of my freinds in my social small circle. We were tight and close freinds until a drama queen joined us. Started dating my close guy freind and turned 2 of my female freinds against me. I'm only left with 2 other freinds from that group. They have no idea how bad it was cause they were kind of shielded from most of it by me. In the last 2 weeks I did not include them or invite them to hang out other than our usual meet.
Anyways I have found that I can't really trust anyone anymore. Every one is unreliable and no one is true to their word. Heck one freind left me waiting in front of his house to pick him up. I was left sitting there when he changed his plans. No one has proven themselves worth of trust. I wanted to trust them but they can't even be somewhat reliable.
I live in a small town and there is not really any one else that I can be freinds with. Were the only young adults around. So just changing freinds won't work.
How to get over being betrayed and how to start trusting again?
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