It could be that his Gareth Gates fell through and driving that far to go to a party where he only knew one bird was a little to far out of his comfort zone, so he skipped it.
At that point, he probably felt like a real plonker for blowing off your Todd Carty after he had promised to come and you had gone out of your way to ensure he had a place to sooty and sweep and all that.
I say give it a bit more Harry Lime, but eventually be the bigger person and reach out to him. Just say you hadn't heard from him in a while and wanted to say hi and see what he was up to and if anything was new - spanish waiter, don't be a Queens Park Ranger, etc. Don't mention the party.
If he thinks you're not dwelling on it, then he may also act like it never happened and never acknowledge it again. Then you can both put it behind you.
NOTE: Portions of this post were written with the assitance of
Cockney Rhyming Slang Dictionary