Love your response. Although existentialism isn't solipsism. It actually acknowledges reality in being in itself, when it talks about phenomena being contingent upon a consciousness that is driven by will it doesn't mean these objects don't exist outside of consciousness, but rather that the meaning of these objects are relative to the willing consciousness. Actually reality I accepted through the acknowledgment of facticity. Facticity is the absolute reality that often stands against an individuals will, obstacles to be overcome such as mental or physical illness, heartbreak, etc. Without the existence of reality, "that which does not kill me" would mean nothing.