She doesn't have to be an ordinary mediocrity either, she might not date any guys to be more unique and individual, concentrating on her studies, books, music, games, travelling. However, she got herself a boyfriend and obviously she was planning to start having sex with him one day, he just couldn't wait. So what's the point of romancing a slut, even if she is your daughter, who was already ready in theory to give her virginity to another guy, other than you? I don't see the reason to date her at all, let her fuck off and turn back to her ex, I'm not going to deal with all her shit.
Petting, I don't know if there is such a term, but as I understand it, it's kind of sex, but without penetration. I'm sure she and her ex-boyfriend liked to get naked and fondle each other's genitals.
Fuck that slut, she better not have been born, ruined my mood.