Just leave them and find people who are loyal and who you can trust.
They are not worth your time. Actually, if you continue to be "friends" with them, you're just going to be hurt in the end and very very disappointed.
It will also be a benefit to you if you leave them because it teaches you that you're strong and brave enough to do that. You'll improve your self esteem and it will make you a stronger person, which is always a plus :)
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