"We had a lot in common" and still the only thing she points out is that he actually does mountain climbing and she wanted to learn about mountain climbing. She probably didn't even know a mountain was climbable before speaking to this "naturally thin" dude. And she's clearly a narcissist, everything is about her, so much she can't see that he was just being kind to her and was actually having a deeper connection with someone else, he should just have been shitlording her. And she's dumb, "naturally thin".