25NL Caught Bluffing. How is My line?

[Knightsridge]

KdQh on button, raise to $1
BB calls, no info on villain
AdTd2d . He checks, I bet $1.5.
6c. He checks, I bet $3.50
7h. He checks, I bet $6
He calls with 55 no diamonds.

Bad play by me or him?

[Nogatsira]

1)right click: make note: 'cant fold pocket pairs'
2)wait for a hand and valuebet
3)?????
4)profit