Upon having relationship with different types of people?

How will I know if this particular person truly cares about my attitude,not a user and is truthful friend?Example :if someone will say that you are ok,but try to change your negative actions of weirdness,does he or she cares about me? Another Example:If someone will say who cares,as long as do whatever you want.. Who will I trully believe??I don't want to be blinded my wrong decisions on whom to follow...Upon having relationship with different types of people?You will know when the time is right and you find the right person to be in a relationship with.