If 4.6 is his 3bet %, not his AF, then he looks like a calling station. He will never fold his raggy A, and never raise with it either, unless he hits a boat or something. So he doesn't have A3, A4 or A8, most likely A5, A6 or A7. It doesn't occur to him that your better A is a reason to fold, not ever.
Once he calls the flop, I am c/f turn and river.