I agree that she is only 19 and that is how girls her age respond to jealously.
It's totally out of order but i do feel it's just one of those things that has to be expected from someone like that.
You can't make a big stink about it either because not everyone will see it as an obvious dig at you - she'll just argue that she genuinely found it interesting and your chat merely prompted her research.
Just keep your distance and hopefully OHs best mate will get bored of her soon enough. Maybe make indirect comments about how a younger partner only make the older partner look even older
It's totally out of order but i do feel it's just one of those things that has to be expected from someone like that.
You can't make a big stink about it either because not everyone will see it as an obvious dig at you - she'll just argue that she genuinely found it interesting and your chat merely prompted her research.
Just keep your distance and hopefully OHs best mate will get bored of her soon enough. Maybe make indirect comments about how a younger partner only make the older partner look even older