A possible leak?

[Mossberg]

Villain is pretty much unknown but I assume he's a TAG or LAG because of his screen-name. I am running horrible (again), and when he C/R the flop I think, "okay he probably has a K, but I'm calling anyways".. The turn card comes and then I see that I have a strong draw, but I completely disregard that my hand can probably see a showdown whether I hit or not.. I miss the river and fold - It's like all I see is the missed draw, and completely forget that I can show down my hand for 1 more bet.

UTG raises, I 3bet with JJ, everybody folds and UTG calls.

flop: KT9r
UTG checks, I bet, he raises and I call.

turn: 8(completing the rainbow)
bet, call.

river: K
bet, fold.

Tilt fold? When I was reviewing the session I saw this hand and thought to myself, "WTF, he could have had AT or AJ".