Learning From Mistakes
Dino has learned from his past mistakes, so we are sure that this would never happen to him again. In the past, he was shocked to see how Andrea reacted. At any rate, the weird behavior she had been displaying gave him some doubts about her loyalty to him.
Opportunities
It was not like it was going to be hard for Andrea to keep an affair when Dino was always away from home. However, it hurt him a lot that she would use his money like that. That was a double-whammy! Dino was one smart fella and started to cook up a plan instead.