Why was Tony telling her all of this? She found she didn't want to hear about him sexually harassing other women or about how he slapped their ass. It was crude and it made her illogically jealous. He was right. This felt different. It was strange and Pepper didn't know what to do with it. She didn't know how to respond. Her usual sarcasm wouldn't do in this situation.
"It feels like I've known you a lot longer than I actually have," Pepper admitted. The statement left her vulnerable and she didn't like that.