Maybe you don't get it, I'll try to explain it in a different way.
Say.. you have a best friend named Tom. You just left him in your world, when you arrived here. Then he arrives too, and has his own digimon partner! But he says he comes from fifteen years in your future. Then he tells you that his life is good, and everyone's doing okay, and the usual stuff, except that in order for him to have that good life you need to die, because you sacrificed yourself to save him, and there was no way to save you too.
Now that you know that you save his life, is it right to not save his life, and thus save your own? If you don't follow along with what had already happened for him, and stay with his history's already completed timeline, maybe your best friend won't be there anymore, just so you can survive.
[text]
Say.. you have a best friend named Tom. You just left him in your world, when you arrived here. Then he arrives too, and has his own digimon partner! But he says he comes from fifteen years in your future. Then he tells you that his life is good, and everyone's doing okay, and the usual stuff, except that in order for him to have that good life you need to die, because you sacrificed yourself to save him, and there was no way to save you too.
Now that you know that you save his life, is it right to not save his life, and thus save your own? If you don't follow along with what had already happened for him, and stay with his history's already completed timeline, maybe your best friend won't be there anymore, just so you can survive.