Why did David forget?

Continuation of my post from yesterday cuz idk how to edit posts. Go find it if you haven’t read it, if you cant maybe ill slap a link in the comments but im too lazy to grab it rn lol

Basically i was talking about how god maddie didn’t initially intend to ditch everyone in the simulation to relive stuff with caspian. Im not gonna re explain that cuz im lazy go check the original post lol.

But basically she was originally saying she was gonna answer everything to the people in the simulation before safe surf grabbed her and caspian. David forgot everything that happened right when he was gonna tell everyone and i assumed she just wiped his memory.. but maybe her wiping her and caspians memories wiped his as well automatically? If she chose to wipe his memory thats weird considering she was JUST talking about telling everyone everything.

Why did maddie change her mind anyways. Did knowing shes not the most powerful/not the one in control bother her so much? I guess the shock of it all left her with a feeling of “what now”, so she gave in to what simulation maddie wanted like i talked about.

Its kind of a shame because when maddie originally came into that simulation she apologized to her mother and seemed to have grown a lot as a person only for her to throw all that character growth away…

But here’s the real question. David and ellen did the memory swappy thing before he lost his memories. I don’t remember the exact wording but i wanna say she said something like “youve been busy” or something that implies she knows what really happened, and i dont think we got any indication that she forgot too so does ellen know?