If he thought she was the 'hurting people type', he wouldn't still be sitting here talking to her. He would've walked away long long ago. And hindsight has an annoying way of being right a lot.

People make mistakes. Even Harvey (even if he probably wouldn't admit it without a really good reason). Teenagers tend to make a few more than the average bear. He knows this. So, he's likely to be a bit more forgiving than he might otherwise be.

He looks at her. "So, you're less into the casual sex for fun and more into sex that means something?" He nods. "I get that." It's not how he operates, but he gets it.