I say hello when I see him and that's it.
Today he was working down the road at another house and flagged me down. Handed me a letter (unaddressed) which he said not to open then (was in car en route to work) and it said he thinks about me all the time & would I like to go for coffee or maybe a walk in the woods! 
I'm happily married. I have to tell DH don't I!