['My friend never paid me back the money I loaned him!', "That's horrible!  This is why they say never a lender nor a borrower be..", 'Well, even worse is that he pretends like it never happened. It make things...difficult']
I hope it wasn't a lot of money.  Sometimes it takes a hard lesson to learn whom to let in your life.
My friend never paid me back the money I loaned him. Even worse, he acts like it never happened!