Well I, like half of you, fell victim to that, which gives us common ground. Our friendships can reach an impasse where one or both parties involved no longer can find perfect union, and then we have a break up, leaving behind us only shards of what used to be. Only little abstract fragments of memory linger on. It seems too bad later, when we consider it, but the truth is, such incidents build better character, and help us to define ourselves for later on. We learn through experience.
Life is composed of trial and error.
If you are really going to learn to swim, at some point you're going to have to get into the water. Falling down and standing back up again is one of the first things we learn in life. Fortunately, the body is built in such a flexible way to do that over and over. Certainly breaking up a friendship is difficult to do, but we'll do it repeatedly, until we get it right. Whenever any failure of friendship occurs there will always be that time for fixing blame.