You're out with DP, friends, DP's best mate and his new girlfriend. Over the night you get the overwhelming impression she is a fussy PITA who acts clingy and needy to get attention and will be one of those women always crying in toilets, spoiling plans and whole evenings trying to be centre of attention. Your maternal bullshit detector is pinging and you are wondering why you should have to tolerate it from a grown woman when you wouldn't from your kids. You are imagining if they get married how you will be dealing with this for many years to come.
Do you corner her in the ladies and ask if she's really that flaky or just faking it?
Or what?
(PS this is all hypothetical)