Exactly, SP. For me a breakup is not only the end of an obsession, but the beginning of a new one. "What if? How dare he? Why did I say that? He's crazy if he thinks I'd..." so yeah, the journal is a way to get all those thoughts out of my head. AND to say all the things I am too polite to say out loud to anyone else.
Because when I break up with someone, I'm mad. Really mad. There is sadness, sure, but mostly I'm mad - at him - at myself - at God. You name it. I guess that's ego, but I'm pretty sure all humans have difficulty when losing love. It's not something any of us want to get good at.