From tiger to pussycat

It's $1-$2 NL, I'm in the big blind with JJ, LAG in mid-position raises to $10, all fold to me and I call. I have about $100 and he has me covered.

The flop is

8 5 3 rainbow

I bet $10, LAG calls. From his previous betting behavior, I put him on AK or similar, but not an overpair.

Turn : T

I bet $20, he calls. I'm not so sure about his AK anymore.

River : 7

I push, he calls and takes down the pot with AA.

A few hands later I look down to see QQ in early position. I limp, it's raised to $10 by the button and I'm the only caller.

The flop is

6 4 2

I check, button bets $10 and I fold. I'm not risking my stack on third best overpair.