If I knew where he lived I would have just gone there anyway.
Maybe this doesn't really help... but have you tried a reverse lookup on his phone number? There's a few available online, for example under the following Google search:
href="http://www.google.com/search?hl=en&ie=ISO-8859-1&q=reverse+phone+lookup
Sorry if it doesn't help much. But I hope you're able to meet/hear from him again soon...