wtf that's it? huhu can someone explain the endingggggg ╮(￣▽￣)╭

After finding out that FL gave MC her time (his original lifespan left was supposed to be 3 minutes) he tried really hard to increase his value to repay her (give back the lifespan she gave him). And he succeeded, he gave back almost all of the time she gave him just for a chance that she may be happier in the future. In the end fl found out MC had 3 days left so she sold all of her lifespan (3 days left) so she’ll be able to pass away at the same time as him. There’s also a novel If you want more details