Look, I'm sure you two have a wonderful relationship but he is being wise and protecting himself. Even if you're on the pill he has to take your word for it. Although I'm sure you are responsible like you say there have been many a girl whose said the same thing and we're actually following up and ended up pregnant. He likes you and want to be with you but he isn't ready for the commitment of a child. You have, obviously, told him your desire and he hasn't backed down. That is really all you can do.... you have to respect his concerns which, frankly, trump yours. There will be plenty of time in your future to go without just not now.