You haven't told us if you guys have an age gap (it sounds like there is, not being funny or anything).
If there is no age gap I can't see you taking advantage of him if he starts to like you too...
All I can say is don't risk your job for love. I know you may have fallen for him but don't take it too far as he may not be interested in you and if you sacrificed everything for it that is a dangerous move.
Wait, I just looked at the previous post more closely...
Oh....seems he maybe your client....well....it depends if you want to hang around with him as a friend rather then a client....seperate your job practise to socialising...but he may not pick up on that so it is a dangerous game...
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"...No matter how people see me as, pariah or paragon, I am but myself." and "I walk the path I walk because it is mine to walk." - Frimelda Lotice (Final Fantasy Tactics Advance 2)