Did you get the money back in the end?
I lend a mate a few hundred quid a ten years back and he never paid it back when he said he would and then stared ignoring the subject. In the end I had to exert a bit of pressure and lo and behold, he paid.
We're still friends and he has grown up a lot in the subsequent years as he has got married, started a family etc, but it still irks me to this day when I think about it!