Hm.. I'm really not sure what to tell you. I know this is an odd situation, and if you're like me and have a run-away imagination, then you've probably imaged every scenario humanly possible (James Bond, anyone?)

Where does he travel? Have you asked about maybe tagging along on a business trip and making it a mini vacation for a day or two after whatever he needs to do there? Maybe ask and try to gauge his reaction.

Good luck,
Ro