Love and relationship are very much like economics, where scarce resources have more value. Make him want you more by being around with him less. Show him that you also have your own life to live – your career, circle of friends, hobbies, among other things. Resist the urge to come running to him at his every beck and call. He will respect you, and love you more, once he realizes that you are his girlfriend and not his lackey.
One thing to take note though – make sure that you are by his side when he really needs you. Personal and family emergencies, failures, success are some of events in his life when he will need you. These are the times when you will have to drop everything and run to his side.