When a relationship suddenly breaks, some people move on, some people don't, or can't. To heal all sorrows after a breakdown isn't a thing you can sail through. Imagine when a building collapsed, people inside would die, or be injured, and so does a relationship. You can't just restart, it's not a single game, we all know.
In a country, when there was a war, there would be three kinds of people. The first kind, stay and fight for the country. The second, leave the country to protect themselves and their families, and might come back when the country is in peace again. And the third, choose the enemy. But is there any difference between a country and a team? The population. When a country lost about a thousand people, it would still be a country. But when a team lost two, or three people, would it be the same? After all, when we look back, we will realise that it isn't it.
Every wound leaves a scar.