Spewing with ace on board?

[yukoncpa]

Hi
This is a 5 handed, 3-6 Absolute game. Villain is 42/20/2.5 after 50 hands, but no further reads.
I open raise in C/O with KJ o, villain calls on button, blinds fold, heads up.

Flop is: AJ7 rainbow
I bet, villain calls

Turn is 4
I check, villain bets, I call

River is 2 ( no flush possible)
I check, villain bets, I call

Did I give him too much action? How should I have played differently?