Props to you for not dragging his name through the mud. Could be that you'll get this part tomorrow or maybe he has a legit reason for not getting back to you.
That said, unfortunately he could very well just be a douchenozzle. Unless he's been in the hospital or is dead... there's really no excuse.
I hate when people tell me they didn't have time to get back to me. I'm like, really? You couldn't spare 3 minutes in the last week to check your email and send me a message? BS.