What does Darry mean when he says, "You don't just stop living because you lose someone" in The Outsiders?

Darry means you have to go on with your life. Losing someone is difficult, but a person cannot just quit living when he/she loses someone who is close to him/her. Life does go on, and we have to accept what happens and continue to live our own lives. If we don't, what is our alternative? The only other thing to do would be to give up. Darry wants Ponyboy to realize that even though Johnny is gone, he has his whole life ahead of him, and he must continue to live it. That's what Johnny would have wanted him to do.