wow, some people have had some really shitty mates! i guess i'm lucky that i have 5 close friends i'd trust anything with.
coldo mate, my only advise would be get your money back someway or another; if you genuinely still like the bloke, stay mates with him but dont lend him anymore money, or forget about the cash and have nothing more to do with him - that would be my choice just for the fact he stood you up
some people are very strange when it comes to money, fact of life