AQo BTN

[bluffbetter]

As played to the river, you definitely have to call this because it's a small bet compared to the pot size.

From your read it sounds like there are several hands he could have here that you beat. Including 65, 54, 43 (I think he would call these suited preflop) and quite alot of other hands (including probably A6 suited and K6 suited) because he sounds very loose.