Mine has forgotten things that felt big to me, but not to her (parent dying when I was 16 and I blamed myself). She said she focuses on themes and emotions. I have had to learn to live with that, especially since I have too much going on now and in the past for her to possibly remember all of it. She is otherwise very good and remembers most things, so I stay. You sort of have to decide what's important, but it is worth telling him that it bothers you.