They just have a strong aversion to used. Damaged is acceptable.At least it guarantees that mc will never ever get her back. I'm glad that otaku media generally have a very strong aversion to used and damaged goods.
She could be on the level of Mother Theresa, but if she's had a boyfriend before whom she's had sex with because they genuinely loved each other...absolute garbage human being. Throw the whole bitch away.
Drug/bullying/family/etc issues with severe baggage and handles it in unhealthy ways like treating others as she's been treated: A-OK as long as she's still a virgin. Adopt this saint.