How should Ethan feel?

Ethan was very shocked to see his girlfriend's baby daddy pop up at her grandmother's house. I wouldn't know how to feel about that honestly. Ethan has a reason to be upset because, now Kathy will focus her attention on the baby daddy instead of him. I wouldn't be surprised if she leaves with him and goes to another city or state. Ethan is going to be so hurt, because he really cares about that girl. He means well and every since he met her, he has been out of trouble. Hopefully, she will not break his heart and decides to stay with him.