How does Dantès respond to the other prisoner’s discouragement?

At first, Dantes believes the man does not trust him, but the prisoner promises that he will come for Dantes when it is time to escape. Dantes responds, "But you will not leave me; you will come to me, or you will let me come to you. We will escape, and if we cannot escape we will talk; you of those whom you love, and I of those whom I love. You must love somebody?"

"No, I am alone in the world."

"Then you will love me. If you are young, I will be your comrade; if you are old, I will be your son. I have a father who is seventy if he yet lives; I only love him and a young girl called Mercedes. My father has not yet forgotten me, I am sure, but God alone knows if she loves me still; I shall love you as I loved my father."