Why does jerry agree to participate in the boxing match?

Although the author does not describe what Jerry is thinking when he agrees to participate, we can assume that Jerry has reached the end of his rope and recognizes that this fight will end everything once and for all, one way or the other.

Although the author does not describe what Jerry is thinking when he agrees to participate, we can assume that Jerry has reached the end of his rope and recognizes that this fight will end everything once and for all, one way or the other.