Going all in

[HPG ADMIN]

Its hard to tell without knowing the other details (was he a tight player, how many people saw the flop, what was the action pre-flop).

There are only 2 hands here that i would be afraid of:
1. He had a pocket 8's and flopped a set or
2. He hit 2 pair with QJ.

Assuming there was no big raise by him pre-flop you dont have to worry about a set of jacks or queens because he would have bumped it alot. In my opinion, he either had:

1. KQ, and thought he had you beat (he probably put you on a weaker kicker/middle pair).
2. Or was very agressive with a draw (J-10 , or a flush draw).