When you try to make peace, either for yourself or between two other people, expect setbacks. They are part of the process.
Many people are happy, even excited, to make peace when they see steady progress. Even if progress is slow, they are patient. But when they are faced with setbacks, they easily give up. When you realize that setbacks are an integral part of making progress, you realize that this is just another step that you have to make. It's like climbing a mountain path. The path doesn't always go straight up. At times it goes around the right and at times it goes around the left but the focus is on eventually getting to the destination. And therefore even if part of the path seems to be descending, it is a descent for the sake of ascent. This, too, is getting you closer to where you want to end up.