forget - me - not : has your muse ever forgotten something that is or was important to them ? are they afraid of forgetting things like that ?
smiles so widely this is a good one. here's the funny thing bill actually seems to be the most forgetful about things that are important to him. it lead to his downfall in weirdmagedon, he got so cocky in his plans he didn't even like. he can see the outcomes of the future and what's most likely! if he checked he could've probably seen oh this is heading down the path where i Die but he didn't because he was like psh... that's not even gonna happen. he's not very detail oriented like you might expect out of him.
however comma that's more of forgetfulness/careless rather then if he's forgotten anything. which he has. a lot of things, actually! He hasn't straight up forgotten what happened to his home dimension, he still like... knows what happened in the back of his mind. those memories are just so far repressed he basically can't pull them back up to the surface. at least not without a breakdown or blacking out. however! other things that are like.. adjacent to that do end up being entirely forgotten. like for example, taking over other dimensions! he goes into doing that, realizes ooooooh this is just like what happened to my home dimension, and sorta "reliving" that experience just causes him to like. black it all out. not saying that he doesn't make that active choice to do that or anything, he's like yeah i'll do this in aaaaa fun way yay!! and then things start burning and people start screaming and things start crumbling and hes like oh this is not as fun all the sudden. and then when its over and done with it sorta just gets really fuzzy until he cant even remember what happened there so he's like yay let's do it again! not to mention that like. the nightmare realm is a dimension that is actively crumbling and dying from very early on, dragging other dimensions into it is kinda the only thing keeping it alive so unless he wants to confront the reality of just letting it die, which we all know he has problems facing the music, he sorta cant do much else. plus! all his friends who live there with him are watching!! cant let them know that destroying things like that is a little distressing!! think of your merciless god persona!!
all that to say he tends to not remember important things whenever it like.. drags up those memories about home. stuff that reminds him of traumatic incidents. im sure if some like horrible medical incident happened to him in current day outside of the backstory medical horrors, he wouldn't remember that very well afterwards either, etc.
as for how afraid he is of it. well. it's less of like.. active fear and more of when he thinks about it too hard, theres this disquieting feeling. its unsettling. he tries to avoid those memories like the plague to begin with, so he doesn't think about it often, but yes, it is a little alarming to him that he can't recall it. what happened exactly? like. that's his life. he's supposed to know everything why can't he drag it up, what happened? why can't he remember if it was his mother or father who was red or blue? so he just opts not to think about it very hard. he'll have 5 more martinis to stop thinking about it, thanks.