If I had a girlfriend, 
I would: 

~give her one of my t-shirts to sleep in
~leave her cute text messages
~kiss her in front of my friends
~tell her she is gorgeous
~look into her eyes when I'm talking to her
~let her mess with my hair
~take walks with her
~look at her like she's the only one i see
~let her fall asleep in my arms
~watch her favorite movies with her
~kiss her in the rain