What should I do about her?

I met this girl on the beach last Saturday we immediately hit it off. We spent the entire day on the beach together then went to our friends house and watched a movie where we cuddled on the couch for hours. After the movies we went up to the rooftop and layer there cuddling. I had more than enough opportunities to make a move but I wanted to show I respect her. After a beautiful night I couldn't sleep when I got home because all that's on my mind was her. The next day I went for a walk on the beach with her and we layed in the sand together just talking and cuddling forfeit 6 hours. Ever since then she's been always on my mind. Usually I am always paying attention to all the pretty girls around me but since I met her no other girl has really mattered to me. What does this mean (I've never really had these feelings for a girl). And most of all what should I do?