One of the best I've read...well not really but I really do like self-sacrifice for some reason...What if the black girl is lying and just want her power, what give the mc the certainty that she's telling the truth, what if the world is not destroyed, what if the one who actually destroys the world is him but the trigger is her, a lot of what if but he can only delay something that's supposed to be set in stone, if the world is going to be destroyed either way, then why not be with the one and only you love at the end of it.
Self sacrifice never pays it off at the end of it.