You can't really get him to do anything if he isn't willing to participate. He would need to have the motivation to want to do romantic/affectinate things.
You could always drop hints, have talks about things that you would like or that you find romantic...
Perhaps find a good hub on ways a guy can romance his lady & provide him with the link.
You could also start by doing romantic things with/for him & see if he gets some ideas from that.
For those really distant fellows - sometimes you have to spell it out. "Hey, honey, next Friday is date night. It would make me really happy if you planned something romantic. Maybe a nice dinner, some dancing, flowers... I'll leave it up to you, I want to be suprised! I can hardly wait to see what you come up with!"