I have no idea what 4.5af means but I don't think someone who's min raising is gonna put alot of money in with a bluff so I think you should just 3b and try to get it in by the river. You don't have to worry to much about 2pair and he's probably 3betting overpairs preflop so there's almost no combos that beat you and he probably has something like jt-kj most of the time here and isn't folding kj unless the board runs out aq or something.