Ace and king magnets...

[Laughingboy]

Hero is in MP with four big titties. (QdQh). It's level 1, so I raise to 50, both blinds call.

Flop: AD KD 2h

It's checked to me. The angel on my left shoulder says check it down, but the devil on my right says bet. So naturally I bet about 3/4 of the pot. (In my defense, both callers paused a long time before calling.) The sb calls, and the BB folds.

Wonder of wonders, the Qc falls on the turn. I bet the pot and am called.
To make a long story short, villain and I end up all-in on the river (a blank), and he shows down JC TS.

Is this just falling victim to a bad beat, or did I make some terrible mistake somewhere? (Note that even if I hadn't bet the flop, the same thing probably would have happened.)