That is a HUGE thing to forget. I am not sure about his excuse of forgetting because it was too painful. Really? A lot of his job entails listening to someone's most painful secrets. If he really did forget for the reason he said then, wow, I would be so uncomfortable with that. I would worry about him being too close and I would also worry about disclosing other things or discussing the abuse further. If he can't distance himself from it then I'm not sure if he can really help you heal from it. I personally would have a huge issue disclosing again because I wouldn't want to cause him pain or whatever he claims it caused him.

The therapist I see now forgets how many kids I have. That doesn't bother me at all. I think it's kind of funny actually, but if she forgot abuse disclosure for the reason your therapist claims I would really be unsettled and worried about the therapy.