It makes you sad to hear how much he's hurting. Do you think he's sad because you're hurting? Do you think he thought about how sad you'd be if you found out he was boinking someone else? Do you think he was wondering about your emotional wellbeing as he pulled up to the hotel and checked in? Is he sad now because you packed his stuff and piled it on his car (good move) or because he hurt you?
Do not listen to him right now. He's trying to manipulate you. He screwed up. You need to move on.