Some things you can do:
1. Write a song or poem about how you feel about him/her or your feelings.
Here are two songs that I think has great lyrics and feelings towards the other person.
Vanilla Twilight: Owl City
1234: Plain white t's
2. Take them out on dates, just you two.
Every once in awhile take your special person out and spend some quality time with them. It could be as easy as a dinner/movie and games at home or a nice walk at the park then some ice cream or dinner after. It all depends though because some people don't like those things, but its worth the try.
to be continue...