How to recognize fake friends?

Hi friends, my name is Ronny and I am here to tell you about a problem. Which I am facing from my childhood. From starting I had a problem which is that I cannot recognize fake friends of my life. Many people in my life act like my friend but behind my back, they use to say me fool. I don’t know why but they are not loyal behind my back. And this is the worst thing I like about themselves. So guys please tell how I can identify such type of person in life.

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