Manga with a girl who is reincarnated continuously before as a boy, but this time she reincarnated as a girl?
this is a completed manga that is supernatural/fantasy, and it involves reincarnation and memory losses. The boy is continuously tortured by the memory of the girl, but in the end the girl told him that this time she reincarnated as a girl just for him.

the beginning of the manga is a man with a dog and a young girl, the young girl supposedly was reincarnated continuously many years ago but this time chose to reincarnate as a girl instead of a boy because she made a promise to a silver haired man. i know this is very confusing but i really can't remember the title of this manga!

so the main character before always had reincarnated as a BOY but this time instead chooses to come back as a GIRL. her memories are sealed.

it is not uragiri wo boku no namae wo shitteru or threads of time.

Honoo no Mirage? It's not the MC that reincarnated as girl, but his subordinate, though...

no, it is about a girl that had her memory/past lives (as a boy) sealed, and then something the guy will do to break the memory seal. i think it is in the fantasy/supernatural genre.. :/ the drawing is so beautiful, but so hard to find a manga when it has been like a few year since i read it

Is it Aragami Hime?

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no although it looks interesting to read! but the one i am looking for can be considered a love triangle, with the main character (the girl who always used to reincarnated as a boy) and two other men... one of them in the form of the dog and the other the male character.

Is it Arcana by Lee So Young? The opening is of an old man, dog and a girl and she is I believe a reincarnation of someone. I am not sure, I read some of the volumes and I think it is what your looking for. The artwork is beautiful as well.

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omg! thank you!! yessss this is the manga!!! you are awesome!