did you put in a time in which to contact you?
send him a message, thought ebay, telling him that you will sencond changece it to the next nighest bidder or relist it if he doens't get back to you withiint 24 hours
you never know, he might have been taken ill himself
i had a bid on something that finished when the wife was in hospital having the baby so when i got back on to have a look 4 days later the guy had asked for paymetn etc and i expleind to him the delay and he took it fine
perhaps that's whats happened this time around?