This was such a sweet slice of life story. I understand the ending. I think the senior trip part was too silly. At one point, he seemed to be responsible and she was just an annoyance and then he used to be completely socially isolated and she had helped bring him out of his shell. Then, he's completely obsessively stalking her and finally, he accepts that she is leaving and he will have to move on and accept it. I also really thought they would end up together.