Men need a little romance and TLC directed their way, far more then is thought.
Time to start slipping a card into his lunch, doing a little extra in regards to his laundry.
Leave a tiny love note in the underwear drawer.
Give him a backrub as he is falling asleep.
Cook meals that he really loves a bit more often.
Do not let him fend for himself
And do not expect anything in return, nor ask him what he thinks about any of it.
Just do it.
You might be surprised what a little TLC will do for the both of you.
He will truly start to look forward to time with you, and vice versa.
ETA: should have added...praise him in public. Don't make a scene, but drop little things about how wonderful he is at such and such around the farm.
Build him up.
He will start seeing the lady he fell in love years ago