Hi jville,
Jesus died once for us all. His sacrifice happened once and for all. The sacrifice of the mass is a non-bloody re-representation of the sacrifice of Calvary, in which Christ offers himself once more to the Father and we, uniting ourselves to him, hope to apply the merits of his sacrifice to ourselves and the world.
Jesus resurrected with a glorified body and he cannot suffer anymore. He is as we shall be in heaven.
Verbum