[dnord]

Ace-whatever isn't obligated to bet this flop - he might be politely avoiding the c/r since you're deep and he's not sure about AQ / AJ. Turn bet makes me think he's thinking "gosh, a second ace, a draw just appeared, he's checked twice, I could bet less than half-pot and see what happens" with a lot of middle pocket pairs, any ace, or even something worse (but if he's good, it's not something else).

You showed weakness again on the turn and he looks like he's taking advantage of it. These look like "the largest bet your opponent will call" and not "the smallest bet your opponent will fold". Villain might be outplaying you or he might show you AJ/ATs, but I imagine he's as confused as you are right now.