Why does false memory occur so many years later

I read multiple articles on false memory ocd an now I’m confused. I actually thought that false memory ocd is marked by things that are actually completely fabricated by the brain. But I keep seeing things like „an event that may or may not have happened“, does this mean that it could actually be true? Are there any ways how to find out if what you’re going through is real if it’s an actual bad act? Because for me I have been completely focused on false memory ocd lately and while I was ruminating on another one, I suddenly got an image of sth even worse that could maybe be like 7 or 8 months ago. I never remembered this happening and for months I’ve been convinced I had never hurt anybody but then I got this image. I instantly also thought that this didn’t happen and that I would definitely remember if it had happened because it’s actually horrible and it’s not just something you would quickly do and then completely forget, it’s an actual entire act. And I never was close to that person. But I keep being like „but what if I listened to my intrusive thoughts? But I can’t remember doing that and I even have posts on here from around that time saying I was too afraid of that person and that I would never ever listen to my intrusive thoughts… but what if I tried to get rid of my ocd theme by doing this? Nah that’s not what I would do and I know that… I’ve never done any harmful things just to get rid of this theme this is stupid“ etc etc. Like I keep fearing I might’ve done this and done it for various reasons. But I can’t actually remember doing it. All those scenarios feel like they’re just imaginations. But I can’t let go of it. And usually for memories it’s that with time you start to be able to puzzle it all together trough evidence and u don’t forget bad things you’ve done. For example, I know that like a year ago I pushed my sister while I was having an argument with her. I remember everything from then because in my entire life I’ve barely ever done anything to others and so I usually remember those events almost 100% perfectly. I also remember sth from almost 10 years ago in which I called one of my friends (and ik this is bad, that’s why I remember it) fat. I lost a few details but I still remember what exactly I did and that the exact same day I called the parents and apologised bc I felt bad. But for this scenario, I’ve been ruminating on it for TWENTY days and I’m still in the doubting stage. I have spent hours ruminating by now and I still don’t have any actual memories back, just things like „but what if I was mad and then just did this and instantly forgot about it?“ and all this. But not an actual full scenario of me doing this even though it could only be a few months away. Idk what To do, I can’t continue living with the uncertainty. If it’s real, then I won’t even continue living. People like these are terrible and disgusting and don’t deserve living and everybody can agree on that.

I deal with false memories, I’ve had a few that have been pretty bad, but normally I’ve been able to tell myself “hey, this is false.” I remembered something a few months ago, and a genuinely don’t know if it’s false? When I first remembered it, it never crossed my mind at all that it could be false. I just assumed it was entirely true. But now that I’ve been thinking about it, there is a possibility that it could be false. It supposedly took place last year during the fall or winter, I remembered it last august. It’s an extremely extremely specific scenario, and the memory is kinda complex. I also vaguely remember remembering it earlier, but it now affecting me that much? Although that could have just been having intrusive thoughts related to the subject. With my confusion on whether or not this memory is false of course comes my ocd shoving it’s way into everything. Something my brain has been telling me recently is “if the memory could be false then maybe only parts of it are and you’re actually just a terrible person” (that would make more sense if I explained the memory). And now I have to keep reminding myself that it’s either all true or it’s all fake, because our ocd would not produce the “better part” of the memory without producing the “worse part”.

My false memory is of me assaulting another human and to make it worse it has a real detail being a towel radiator. I tried to guess what I would’ve been leaning on if I was standing in a specific place in a room I went in yearsss ago and I kinda just guessed a towel radiator and to my shock looking back at the old pictures I got it right…I don’t remember assaulting anyone though? It’s scaring me as yes the towel radiator was there but I do not recall harming another human it’s sooo against my nature even drunk. So now my ocd is using that towel radiator against me saying my whole false memory must be real as it has a real detail? I know it’s probably laughable to some people but my whole life is being ruined right now by a radiator. I’ve spoken to a therapist who kept saying she didn’t really understand what it’s got to do with the false memory. My family and partner keep assuring me I would never do that and to just move on. So why can’t I move on?! Anyone dealt with anything remotely similar?