How to spice things up?

Ok so i have a little problem.. Im 16... almost 17.. My boyfriend is 20. We've been in a serious relationship for the past 6 months. The hoony moon phase has past.. We're very sexually active but heres my dilemma, when we're not having sex, everything else is kinda same old shit.. I really want to make him want me and be more affectionate towards me when we're not in bed. But how? Do i play hard to get? Do i be less affectionate towards him? How do i get him to get butterflies when he see's me again like it was when we first met? I guess what im asking is how do i keep a relationship like this alive and still new and fun without sex? Any help girls?!