Kondo Koso Shiawase ni Narimasu!

Before the hero, Graham, goes on his journey to defeat the demon lord, he asks his beloved Louisa to promise to wait for his return. He is both her childhood friend and beau. Except, she has no intention of waiting for him at all. The truth is, she's been reincarnated three times, and all three times the heroes were always her childhood friend and boyfriend. And every single time they went on their journeys to fight evil, they found someone else and never came back to her! So, she's never waiting for any hero again, and in this life time she's going find happiness somewhere else! A fantasy about a super independent girl!

(Source: Alpha Manga)

Chapter count includes four extra chapters