Sensei to Himitsu wo...

At a "welcoming dinner," Umino and her former high school teacher re-united. It was because of him that she decided to become a teacher and eventually enter a relationship with him. However, what was supposed to be a beautiful relationship for Umino ended abruptly when he said "I fell in love with somebody else."What will happen to Umino after her failed relationship? (Source: MU)