I'm in a similar situation with a younger guy. The lies are different but the behavior (on both our parts) is the same.

The problem is that you have set the tone for how he can treat you in the relationship. You forgave him over the money thing and the porn thing. Now he knows that all he has to do is say sorry and everything is fine.

He's not going to stop looking at porn. If it bugs you then you need to not be with him. If the relationship is worth keeping then you need to let the porn thing go. A lot of guys look at porn and don't see anything wrong with it. From the sounds of it, he's not going to stop because you say it hurts your feelings.