It is difficult to speculate but the range of the villain had to be Ax, I do not think he had two pairs just overpair and after your check on the turn he thought you wanted to have the pot with a medium or low pair, if I have to guess I would say that villain has A10 he considered that his A was winning and he was not so wrong your Cbet was low and the turn that was not good for anyone was check, why not think that with an A and a good kicker could you win this hand? I don't think it's a bad move on the part of the villain if, in fact, this is what he had, I repeat it is very difficult to speculate