@ssakuraa My guess is the logic is probably along the lines of: She broke up with him, he took the trip to clear his head, he died, ergo she caused his death.
plz I hope mc ends up getting together w eunjae instead.. mc was literally sent back to her high school self but she's still got the mindset of an adult.. to think she still acts this weird around a high schooler is just odd lol. besides eunjae is cuter