It sounds like that "open relationship" bollocks people talk about. Not a fan of it all, to me, someone is kidding themselves if they claim to be in a relationship with someone, but still chasing other partners. Maybe I'm old fashioned like you, but most women I know aren't like that either.
You could probably put a stop to it before it even started by telling the next gf that your previous was into the whole open relationship thing and you didn't want that at all, most women I know would be happy to hear that tbh.
You could probably put a stop to it before it even started by telling the next gf that your previous was into the whole open relationship thing and you didn't want that at all, most women I know would be happy to hear that tbh.