Hina decided after careful consideration my ass!!
Careful consideration would have actually involved talking to all interested parties, like her mother, and sister and Natsuo.
If she wanted to break the relationship off like an adult, she should have done it like an adult...face to face.
Also Natsuo's friend and Natsuo can shove "if I meet her now, I've wasted her resolve" up their ass.
What she is showing isn't resolve, it's cowardice. When Natsuo and Hina decided to cement their relationship, they acknowledged the risks and vowed to continue it anyway. She hit a small bump in the road and bailed.
She failed to even consider Natsuo's feelings. His dream of becoming a novelist was enhanced by his desire to be with Hina. Being with Hina was also his dream. So Hina trashes the part of his dream that was a sure thing, because she thought it was hindering his other dream which is far from a sure thing. Not to mention, breaking off their relationship the way she did, with no communication, with no understanding, with no agreement, just led to Natsuo's depression. He could have done some very reckless and dangerous things to cope with his grief. He might have even just quit school and abandoned his dream, just to chase after Hina.
