Even if he was sorry, and even if he would've liked to do things differently, it was still clear as day he couldn't do the domestic bliss thing. Not for long. So, it was best to just keep things as they were; he couldn't magically turn back time, anyway.
"And how!" Matt kept on smirking, even after her look, even after she apologized. Which she didn't need to. "Ah, don't say that." Was the best he could come up with.