The cultural aspects you may not be aware of is that men who travel for business often want to hook up with pretty young girls because their wives won't be able to find out. Also, these men will never leave their wife, especially for someone whose age is such an obvious issue.
The reason he is still hanging around is that he is waiting for you to let your guard down because he knows you are on the brink of giving in.
Be smart. Give him the boot. Forget about being friends - he's not interested in that.
Relax... I'll need some information first. Just the basic facts - can you show me where it hurts?