Forgotten Title Manga or novel

I'm looking for a manga or a novel that have about one or two chapters released? It's about a hero going to defeat the demon king and make a promise to his childhood friend to wait for him. After the hero left, the childhood friend quickly tries to find another lover because she had reincarnated and she knows that the hero won't keep his words.

Edit: the childhood friend had reincarnated multiple times and experience the same situation each time, it's not a time loop.

 

Wow, that's some twisted thing going on there

 

This sounds interesting. I think I've read it before.

 

It sounds something like The Hero Cucked Me of My Childhood Friend, so I Think I’ll Steal His Fiancee

 

not that one, the childhood friend have reincarnated multiple times and experience the same situation each time she reincarnated.

not that one either

thanks for trying