> i'd remind her that she herself smanged some
>dudes casually and they're not a big deal to her anymore

And if she finds out (especially from hearsay) that a chick her man introduced to her as a friend was someone he used to have sex with...she's not going to b down with that in no way whatsoever

First off, by him not telling her, the optics of it seems like he might still be having "casual sex" w/her since he didn't bother to mention they were casual fuck buddies

And lastly, we all know women *in general* don't trust even their home girls around their man...so you already know what's up in regards to a chick he used to have sex with.