How wrong did I play this river??

[Sintax]

Dont have the hand history to post, but its been bugging me all day.

I was playing 5/10 at UB. Folded to late/mid position loose player who limped. In cut off, with AQs I raise. Folded around to limper who calls.

Flop QJ9 rainbow. Limper bets, I raise. Limper calls.

Turn 5d - two diamonds on board now. Limper checks, I bet. Limper calls.

River 7h - Limper checks. I bet. Limper raises, I call.

Limper takes down the $107 (10.7 BB) pot with Q7 off.

Should I ever have bet out on the river? I do think this is the type of player that would call with any pair.

Should I have definetly folded to the raise? Its a big pot, and I doubt theres even a 10% chance of any player trying to bluff in this spot.