Perhaps he knows you from your spiritual existence or a past life and his mind leaves your face blank because he unconsciously connects you with many?
Otherwise psychologically, I would say that to him, your appearance isn't an issue. Which is good news for you! Because he then loves you for your personality, not your looks.
I personally never see faces unless my dream is intuitive. If it is intuitive I look directly into their eyes and see and spiritually sense in full detail. So not seeing a face is common for me.