He cheated on you, and he regrets it.. of course he does. You have every right to be upset with him. He wants nothing more than to make it up to you, and show you that what he did was a mistake.

However, ever since you gave him another chance it’s been different. The way you look at him, you hardly make any effort to show affection anymore. It's not the same..

“What’s wrong my love?”

He feels like an idiot for asking, because he knows exactly what's wrong.