This happened just a few hours ago between me \[18, M\] and my girlfriend \[18, F\]. We have been dating fairly seriously for over a month at this point.

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We were on the topic of her favorite K-Pop artist (which I don't care for K-Pop whatsoever, but I try my best to pay attention)  "Jung Yong Hwa". As usual, she's completely fangirling over him, which bothers me a little bit, but I can understand where she's coming from. In general, she's not very complimentary towards me--every now and then I'll get a "you look nice" or "you're really funny". However, when talking about this guy, she is completely balls-to-the-wall. It's just a constant stream of "he's so talented, sexy, hot, funny, sweet, etc.".

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Keeping in mind, she has never met this guy or been to one of his concerts. Only through listening to his albums and liking every single one of his posts on Instagram (she went back a few years and liked every single one forward from there). She is currently saving money to get a tattoo of his name on her chest.

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Now some of you might have your YTA's typed out already, but I am actually okay with all of the above, including the tattoo. What she said today is what caused me to lash out:

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She said "Nothing could keep me from going to his concert in Korea this November."

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I laughed and played along, making up some stupid circumstances, all of which she said she wouldn't care and would not hesitate to go to this concert. Then, making an obvious mistake, I said:

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"What if I was in the hospital (as in, seriously sick)? Would you still go?"

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I did not expect the next answer at all, mainly because there wasn't one. She just stared at me awkwardly for a few moments, then said "... Do you expect me to lie?". I spent a few minutes confirming she was completely serious--which she was, which left me completely heartbroken.

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At this time I swiftly called her a complete psycho and cut the relationship off. Was I the asshole here?