For those saying Dan-I is being too stubborn remember she is living in a world that she has no certainty in being remembered in or even existing and fears that she will never return there. Of course, she doesn't want to get involved in a relationship at the moment especially with those four, she still thinks her life is an internet novel and she is right to an extent and she had this happen to her when she hit middle school when she was very young. That around possibly 13-15 maybe younger. How can you be sure with that uncertainty?
Course it will lead to hurt but who knows what even going in a relationship at the moment might lead to once March 2nd hits again. Because once March 2nd does that boyfriend doesn't exist, along with all your friends. that will lead to some serious anxiety and dread. It's hard for Dan-I even being friends with them, let alone having a boyfriend too.
Yes, it will lead to hurt in the long term, but Dan-I is also trying to be practical here.
For those who know spoilers, I know, I'm just trying to understand Dan-I right now.