She says that, which means Richie automatically glances down at the hand in question, then immediately realizes what he's done and has to act like he didn't just do that and ends up looking all too obviously out at the rest of the party to try to cover it up.

"I, uh." He rubs his cheek with his free hand. "I'm sorry?" Winces, hearing himself say it. "Sorry. Shit."

This might be why he hasn't had a second date since his divorce.