Should I have shown my cards here?

This example is from a $2 Max, .01/.02 blind, NL Hold Em game. So I am obviously not up against Doyle Brunson here, but I am really struggling with getting a handle on NL ring games, so any feedback will be appreciated. I understand that it may be tough to give advice about games at limits this low.

I was in LP with QQ, several people already in the pot. I raised, and got 2 callers. Flop comes J72, rainbow. Opponent in MP raised the pot, I reraised the size of the pot, and he called. The other opponent folds, so it's now head to head. Turn comes another J. Opponent goes all in, he has me covered, so I fold. When I folded, I showed him my cards, this is the point I am not sure about. Should I have showed him that I was folding an overpair?

Now I don't believe that my opponent had 3 jacks or better, as he became even more aggressive the rest of the session, and put me all in 3 times, when I was ahead. As it happens he sucked out on me 2 of the 3 times, so it was a losing session, but showing him the Queens did seem to pay off. He was eager to go all in, out of position with mediocre hands, and draws. Do you think I did the right thing showing the Queens? I usually don't show anything I don't have to, but I got an impulse, and in this instance it seemed to get me a lot of action from this particular guy.

don't give them any more info about how you play than you have to... unless you are trying to tilt them when they fold.

- sed

Did he show you his? Or nodd that he had the 3 jacks?

I wouldnt of showed on that play even though if you made the right call to fold then gj.

Thanks guys, I thought I made a mistake folding, and you confirmed it. No he didn't show, I was just thinking he didn't have 3 jacks, from the way he played the rest of the session, but he may have, and I couldn't call there anyway.