I don't personally take issue with porn, it's the turning you down and looking at your sister I take issue with. And, instead of saying, "I majorly effed up. I was wrong," right away, he made up two excuses that were both, in some way, lies.

What strikes me is his being out all night and not telling you where he's been. Honestly, where does a person go when they are out all night? How long are bars open in your area? Does he have friends he'd be staying with? If so, why?

Things don't add up, and he's being incredibly shady about both things.

I ask the same question as Bill3: If these two things are not enough for you to end the relationship, what will be enough? What will have had to happen before you can't take anymore?