Curiosity Killed the Cat

In the end, it is Ginny who comes between them. It was unintentional on her part, but there it was. Mike and Amelia were arguing about what was best for Ginny and then realized that they couldn’t be who she needed, and who they needed to be for her, as well as be together. The split was amicable, and they remained friends, but they no longer worried about hurting each other’s feelings when it came to doing what they thought was right for Ginny. Even though it sometimes differed. It was easier that way. All good. They could argue and fight, and then do what each of them thought was best for Ginny. No harm, no foul, and no consequences to their fling. Until Ginny found out. And not from them.