If that's the only suspicious charge there in 12 months maybe he's not cheating, I would think you'd find more than that. It would explain his behavior though, did you ask him about it? He could have been buying porn or something for himself.
Given how controlled he is do you think he would hand that to you without reviewing it first if he felt he had something to hide? I would have thought if he was feeling guilty you wouldn't have gotten that statement.
Accuray
Married 18, Together 20, Now Divorced M: 48, W: 50, D: 18, S: 16, D: 12 Bomb Dropped (EA, D): 7/13/11 Start Reconcile: 8/15/11 Bomb Dropped (EA, D): 5/1/2014 (Divorced) In a New Relationship: 3/2015