I lost a huge pot here. I flopped top set. Opponent was not very imagnative, he was clearly scared -- he took a long while to call my 4-bet and yet he led out turn. Would he have led out unimproved?

I didn't shove flop only because I didn't want to lose him. Was it bad given that I failed to fold even after I was outdrawn?

http://www.pokerhand.org/?785267