When a girlfriend put nasty pics of her in thongs should I leave her or not
I would not leave her right away - I would talk to her about them first. Tell her that you do not appreciate her having skanky pictures up on the internet and that it is very disrespectful and that she can either take them down - or you can walk. Simple as that.
Depends on where she put the pictures really.
If they are on the internet where everyone can see them you need to talk to and ask why she did it and then deside if you can trust her and want to be with her.