Men really like to be important in your life, so try to share your life story with him as much as you can.
Tell him about your work and your friends, ask him to help you decide which shoes to buy or ask him to help you with that new project at work.
Make him feel important and irreplaceable. Tell him all that he wants to hear to boost his ego and to make him the one and only for you.
That will make him have his eyes only on you and he will be yours forever.