Why guys test girls to see if they like them and when girls show interest they leave?

I don't understand how some guys think like why would someone be so interested in a person and literally go out of their way to test if that person still like them? Don't they have the knowledge to understand that THEY are giving the wrong message to the other person that they are interested in them too?

And the funny part is that they go to their friends telling them how great catch they are and how girls want them when THEY ARE THE ONE WHO MADE THE FIRST MOVE !

Why guys test girls to see if they like them and when girls show interest they leave?
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