My partner said he doesn’t know who I am anymore

We have together for 10+ years and living together for 3 now. I recently said that I am an open book to you and he made the remark “ book of which pages are vanishing". I got very upset and it was like the existential crisis hit me. I thought this was more towards me where he felt that I am loosing touch with myself.

But today in a severe fight he said he doesn't understand what I expect from him (even though I have given in writing, said verbally as well what I want from him.) I need love affection and attention ( i come from a neglected family. And I am not saying to run after me every second of his life but to make me feel exclusive. During this fight he made it very clear he doesn't know me at all. He doesn't know what things I like or dislike or even the kind of person I am.

I am feeling confused.. Is it me who has changed? Or is it him that over 10 years of being together he doesn't know who I am. I am not saying he is wrong, And i have been in therapy for 1.5 years now and have been working through my issues but now I just feel numb. I don't know what to do anymore...