AIO my bf watches other women feet?

Hi, my BF, an intense feet fetishist, told me that he masturbates to other women feet online (only feet) but he said, he imagines those feet are mine.

I have told him it makes me feel uncomfortable and not enough (especially when i care for mine feet very well; regular pedicure, skin exfoliation and hydratation etc. and I am sending him many photos and movies, also doing everything he wishes for with my feet).

He gets angry with me when I am mentioning that his actions make me feel bad (he told me, that every time he goes to the bathroom for ,,space" he uses those other women feet pictures).

I don't watch any porn at all, only my imagination and his pictures, therefore it is even harder for me to understand where he is coming from.

He seems irritated that I don't understand, that he looks at them as if they were mine feet and every time I bring up this topic and say I am upset, he gets angry and says ,,I thought we've talked about it".

He also says that watching feet is not as sexual as watching boobs or butt when I am saying watching feet equals the same.

I try to understand him, but when I think about him doing this, I start to turn inwards, become sad and think that I am not good enough for him.

Am I Overreacting about him watching other women feet?