Tell your partner often that you love him or her. We all need to hear this. Yes, we can show them our love by doing things, but there is something extraordinarily reassuring to hear your partner tell you how much you are loved. Say it because you mean it, not because you feel you have to. Compliment your partner - but do it honestly.
Empty compliments can hurt.
Better yet to look for the beautiful things about your partner - both outer and inner beauty, and express your appreciation for them. Never purposely hurt, for that destroys intimacy quicker than anything else. Share a physical intimacy, in a non-sexual way. By this, I mean spend as much time as you can with your partner, including private times, like bathing. These are very special moments to me and I wouldn't give them up for anything.