@mrmm Man, the exactly same story happened to me with one of my ex in high school. Someone listened to some jokes I did with a pal and somehow it turned out I was a Ugly Bastard© wanting to get laid to win a bet.
The day I knew my ex was believing this bullshit I met up with her and broke up immediately, mimicing one of my personal idol by only telling her "Sup', you're dumb and I can't trust you. So I'm breaking up. Have a good day miss.", I just waited for her to answer me "Ok." and I walked off.
And for a good month I was the Ultimate Ugly Bastard©, but thanks god I was prepared and always refused to have sex because I had the feeling something like this would happen. So I was only an hating man, false-hearted, manipulative and misogynist. But these kind of things don't last when you're straight laced and true to yourself, I was by no mean rude before and I wasn't after, so people just forgot about it.
But yeah, some women are really sly and don't think twice before breaking you down physically and mentally by pure egoism, and with them you need to always have a good hand and be the first one to move. I had worse things in my life so I can live with people hating me or being disgusted by me, but I know some guys who were close to suicide after shits like this, so be careful guys (and girls, what I said applies to everyone), and take care of yourselves, be strong.