She didn't mean to make him startle... but the blush is very satisfying. Until she hears what he's saying. Her face is a serious frown, an uncommon look for her, and she reaches to touch his cheek and turn his face to her.

"Hey, I don't know who you used to know or anything, but you're here now and I promise you I don't scare easily."

So whatever it is you're hiding, and she can tell you're hiding something, she's determined to find it out and help you heal. It's what she does after all! It's her Thing, her schtick. Trust those big innocent eyes.