u/Brangusler what the fuck did I just read, go get help

That last part is what strikes me, too. Complete disregard for OPs wellbeing, metaphorically punching once more with that reaction.

If she's really that quick to question whether she wants to stay with you, I'd overthink whether it's worth staying with her.

No, seriously. If you explained to her what you just wrote here - that you barely drank and might have been drugged - and she's still questioning herself with you (if there was no such incidents before), then she's quite quick to leave. Better now than later, as hard as that may sound.

(Don't get me wrong, she's still of course got all right to be mad at you for what happened. I just find that reaction a little far taken in relation to what happened and what the circumstances were. Did you seriously hurt someone? No? If it was just a ruined day - sometimes, things turn your days to shit, and it can happen within seconds. I'd question whether she appreciates the effort you put into making this a good day for her, which at least taken from this post you say you did).