What does ponyboy mean when he says johnny is dead but he isn't?

When Ponyboy says "Johnny is dead but he isn't," he refers to the profound impact Johnny had on his life and the memories they shared. Although Johnny physically died, his spirit, values, and the lessons he imparted continue to live on in Ponyboy’s heart and mind. This sentiment reflects the idea that people can remain alive through the influence they have on others, even after their passing. It highlights the emotional and psychological connections that transcend death.