I've had to deal with many deaths, but I've always either been forgotten by the time my closest family dies, or I've forgotten people pretty quickly myself.

  If I don't then they won't be able to live again.

  Reincarnation is normal, expected- even. But the catch is that they have to be forgotten from all living memory before they can come back.

  A couple of centuries ago, some random kids found that if you remember the person after they've been reincarnated and have formed a bond with you, they can continue living. However, if you remember them while the bond is still weak or nonexistent– they'll die.

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  I didn't think I could die when I was with her. I made her promise that she'd never forget me.

  But, after sitting in an endless void for over 300 years, I almost wished I hadn't begged her to make that promise.