So why would he want to forget it?
It shouldn't be too difficult to convince someone that something can't be recalled. Unless he'd been hypnotized, I can't see how one would know whether he couldn't remember or was saying he couldn't remember. I'm not certain that anyone involved with the workings of the mind, be they psychologist or lowly counselor, would ever speak in terms of absolutes. Far MORE likely is that expressions such as "it's possible that....." "He may have...." would be used.
In the mid 90's I received notification from the bank that they were calling in their loan and would be taking possession of my home. A) I hadn't taken out a loan, B) I'd never defaulted on the mortgage. When I furnished them with this information they told me that my husband had taken out a loan -we'd been divorced some 4 years at this point- to which I replied that he couldn't have done that without my permission or knowledge which I swore, I'd never given. So angry was I that I wrote a piece for the local papers, and spoke about it on local radio. A meeting was finally arranged where, to my horror and acute embarrassment, a document was produced which had my name written all over it. Every available space had my signature on it. It meant that not only had I given my permission, I'd also gone to the solicitor to sign the document confirming such. Until I saw the document, I had no recall of any of what had happened. It had been a time of huge emotional stress -husband on the verge of bankruptcy, a failing marriage, a house with no floors, no running water. Being asked to risk making myself homeless to prop up an already failed business, was more than I could cope with -recalling it now makes me feel unsafe- hardly surprising that I buried it.