In my experience, people don't forget these things. It's ammunition to use later down the line. Something to protect yourself with as much as it is to harm.

[It just drove home further the reason he'd been prescribed the medication and now bi-weekly sessions with someone who somehow knew the way his brain worked better than he did.
Passively he lets Yugi push him back, just accepting this gesture.]

I thought I'd have woken up as furious with you as I had been when you defeated me. But... I was a bomb waiting to explode. Looking back, remembering how angry I was, the things I wanted to do. I was scared of myself. I was so driven to be in control that I wasn't. I hadn't had that kind of freedom of agency before and I was willing to destroy myself and everyone else. To stop myself from being in that place again.

[There's almost a blankness about him as he continues talking, not quite robotic but it's apparent that the medication is numbing him to a degree.]

...This doesn't leave this room. Not until I'm ready to do it myself.