I can understand being in debt. I've been in debt a few times myself and people were always kind and patient to me. But to pull this shit without the intention of paying it back is unacceptable and I won't tolerate or allow this kind of behavior on FTR. If you value your reputation or you consider yourself a decent human being at all you will pay Keith back.
If not I hope you don't screw over the wrong kinda person who will cause you physical pain for it,