Tell her she's amazing. Tell her why. Pick her up and pretend you're stronger: she'll scream and fight you, but she'll secretly love it. Hold her hand. Tell her she looks beautiful. Introduce her as "the most amazing girl I know." Tell her stupid jokes to make her laugh. Throw pebbles at her window at night. Surprise her. Do things that make her smile, and make her want to kiss you. Be spontaneous. When she starts yelling at you, tell her she's beautiful. Let her fall asleep in your arms. Call her back. Sing to her no matter how bad you are. Get her mad then kiss her. Push her on swings. Give her piggy back rides. Stay up with her all night. Leave her little notes saying how much she means to you. Make up nicknames. Remember dates and surprise her on the anniversary. And most importantly, when you fall in love with her, tell her.