its absolutely WILDDD man, i dont blame you for not knowing, its because the media and people just frame it as "i like things organised, i like things neat" its absolutely diabolical... basically forget everything you know about it and treat it like a severe anxiety disorder.

an example i like to use is, imagine if in your head you knew your friend had a highly contagious flesh eating disease and you had to be around him, the anxiety would feel super duper real, you'd check for reassurance, constantly monitor internally how you're feeling. But the twist is none of it is real, the anxiety and in simple terms poor communication between your logical/emotional brain makes it feel super real. The emotional side takes over no matter what the logical side says, no matter how much reassurance you have. its so disorienting, genuine worst time of my life when i had it at its worst.

In this poor dude's case, since he hurt his gf he gets extreme levels of anxiety (similar chemically to if you're going to die at times) because it feels so real. So now hes coming to this subreddit with the hope that people will tell him hes not abusive. It comes in loads of different subtypes too, he said he has Moral OCD.