Loveable Mermaidz

How do you judge a true friend from the fakes?? I mean all trough out your life you are gonna find people who are your friends one minitue and then when you dont want to do something for them turn on you. Last thing you want is to waste your time on fake people who’s never gonna have your back when you need them . So what do you do when you have spent all your time making them your best friend and then later on find out that they are way fake what do you do??