I don't mind. I'd had the images in my head, and also had what appeared to be PTSD symptoms (this was pointed out to me by a doctor) and this was confusing as I couldn't think what could have caused a trauma. I was afraid I was going crazy tbh.
I stopped thinking about it, as life took over - FIL died in a car accident, DSis divorced, infertility, adoption etc. Then my DSis had a clear flashback, and I was able to connect it with an incident in our past where there clearly had been inappropriate stuff taking place. I then realised what the images were, and, instead of pushing them back, I allowed myself to remember the incident in full. It wasn't involving my F, but two others, one the man I remembered from the past and another younger man. My F was in the flashbacks, in such a way that he must surely have known what was happening.
We reported the incident to the police. They traced the man we remembered, but he was dead. My DM had been suspicious of him, and the hotel manager hadn't liked the way he was around children.
We never knew the younger man's name, but my DSis remembered him as having worked at the hotel. The police traced a man who fitted the description and age who had worked at the hotel, and my DSis identified him in an ID parade of photos; she was the one who had chatted to him at other times. The Police were sure they had their man, but it wasn't enough for the CPS to prosecute, as DM didn't remember him and neither did my DB, although we remembered him being in the room with us. He was sadly abused too, and participated, though under duress. He's seriously mentally ill now.
After all this, I had EMDR, not to bring back the memories but to process them. It did the trick, I no longer have flashbacks, but it left space for a lot more memories to come back, which I've been processing in therapy since then.
So it's a very long story. It's been a horrible process for both of us, but we're coming through it.