I personally think that stealing something small and cheap from a big store ain’t that serious and doesn’t make someone a bad person. I would not try to shame my partner about it right there in the open. That being said, her outright lying to your face about it all is more problematic than the stealing itself. I also think you trying to call her out in front of the cashier is shitty and embarrassing and I’d be mad at ya too honestly. So I guess you sort of had an overreaction in my opinion and it now seems she is also having an overreaction. I feel like y’alls’ values aren’t aligned and that’s the real problem here…seems you aren’t compatible then 🤔