There's a saying where I'm from, that goes like this. "It doesn't matter who's right or wrong, just fix it!"
Oh, if only more people would follow that. A lot of people, especially young people get in trouble because of this one thing. They do not know how to focus on the problem and not the person. So they hold grudges, hate the parent, turn against the brother/sister, fight, or do something else crazy. All because they didn't try to be the bigger person and fix it.
There will always be problems in life. Life is not perfect, and nor are people. So when things happen between you and someone, take the initiative to fix it. Don't wait until they come back to you begging for mercy, because what if that just won't happen. You be the bigger person... Even if that means you having to apologize. Just do it.
Just fix it.