It was he that kissed her, there's a difference, and even that is questionable tbh considering that she apparently didn't even notice.
"he kissed her on lips ( dont think she really twigged that he did to be fair to her) then he went in for a snog and she then pulled away and went to dance with 2 other guys."
It's irrelevant, she was talking about touching the guy's penis and making it erect. Prior to this she asked the OP to leave the room (or whatever). I find it quite odd that you can't see how this might be a relationship breaker for some people.