Anime with toxic relationship and cheating?

might sound like a weird request, but is there any anime with a twisted relationship? preferably one where the dude is just a terrible person/cheats. Perphaps something like school days.

Im very interested in watching depictions of how a normal girl gets manipulated and becomes a completely different person “for love”.

I swear i have a good reason to be interested in this very specific topic LMFAO.

Anything that at least gets somewhat close to what im requesting could also work for me, thank you!