*spoiler*
Oscar is also a regressor. He remembers everything from all the previous timelines, unlike Ines who does not (yet) have memories of her first true timeline
I feel like that is more or less revealed in the story now. But it's not clear since when. Since childhood like Inès or later?
Considering the way he pursued her as kids and brutalized Carcel, it’s since they were kids.
MORE SPOILERS
And I’m pretty sure he also remembered every life in their past lives too, when he married Ines. I thought weird af that he would especially brutalize and r*pe her when she and Carcel so much as exchanged a look, especially since only Carcel loved her back then, but when someone confirmed that him marrying Ines in their second life was to basically get back at Carcel, it made sense. Apparently, knowing what kind of man Ines liked from their first life when she was married to Carcel, he presented himself in a way that would charm her only to exact his revenge once he finally married her.
I think this one of the best portrayals of an abuser that I've seen.
I wonder when Oscar started to remember, and if he was obsessed with Inès before that.