Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: Apologies in advance for formatting, I'm posting through my phone.

My gf (F20) and I (M21) are usually super chill and dont fight very often. We go to the same uni and we love making fun of these over dramatic couples we see or hear about from our friends, by pretending to have a fit over a really small issue ("OMG HOW COULD YOU NOT HOLD THE DOOR FOR ME? WE ARE SO DONE!") just as a joke between us.

Now for the fuck up.

My gf usually has rreaaally bad period cramps, to a point where she can't walk back to class if we're at the canteen. She just clutches her tummy and lays her head on the table and prays for the pain to go away. For the 8 months we've been dating I've bought her chocolates every time it was her time of the month to sort of distract her from the pain cuz I heard chocolate works wonders (and fellas, it really does).
But this time I didn't cuz I'm literally broke to the bone cuz of buying materials for class. And she got really mad at me.
At first I thought she was doing the overacting drama thing as a joke, so I played along.

Her: WTF, the one time you needed to pull through and you let me down?! (╯°□°）╯︵ ┻━┻) 

Me: Oh I'm sorrryyyy, but does it say "room service" tattooed on my forehead?

And this is when she shoots me this look of absolute disgust, and gets up and storms out. Me being the dumb bitch that I am thought she was still pretending, so I was sitting there waiting for her to come back so we could laugh it off. Except she didn't. Turns out she walked back home (she lives pretty close to uni) alone.
When I texted her and asked her what happened. She said that my reaction was totally uncalled for and all she asked for was a chocolate. (gf is from a well off family) and said its impossible to not be able to afford even a chocolate. And now she's being lowkey salty towards me.

Women of reddit, help a brother out. Pls. I really like her and I don't want things to spiral out of control.

Pavlov-ing my gf