How to stay friend

How do you stay friend with someone you love with all your heart and who says he doesn't love you. How do you still stay friend, see him everyday, share the same bed and not cry. How do you do that when you still love him, how do you ignore that love when you fall asleep only when he is here and has his arms around you. Can anyone really do that when it hurts that much.....???? Why do people say love you when they don't feel it and don't mean it, is it really our fault for not seeing it coming???? How do you stop loving someone in just one day, is that really possible??? I wish it could be possible for if I could take out my heart to stop this loving and hurting I would had done it.... why does the heart hurt that much when it............