Communication is the biggest key to keeping relationships strong, in my opinion.
It's fine to do a few nice things here and there for him, but you don't need to go overboard. If you do, the nice "extra" touches will soon become expected things. After 20 years, I still do little things for my husband too, just not constantly. I want those things to be surprises that make him feel good... I don't want them to start to feel "old hat."
Send him a cute text once in a while. Greet him happily when he comes home. It doesn't have to be big to make him feel good.