I know little about philosophy and Heidegger, and I only understand these two sentences literally.
Born to die: for every individual's life, it has been going to die since birth.
Because the dialectics of life tells us that there is death when there is life. Once born, it means you will die forever. In this sense, people live towards death. )
Die for life: for a life group, its death is for a better new life.
Metabolism, the old and the old die in exchange for the birth of new and progressive. In this sense, this kind of death is not meaningless, but a valuable and meaningful death for a better new life. )