Just like self-blame, there's no room for outward blame in your party of two either.
Blame can open the door for heightened emotions and tension. And under those circumstances, how can anything be solved?
Instead of placing blame, try to understand where the other person is coming from and the line of thought behind their actions. If something still bothers you after you're able to understand the situation fully, then communicate your concerns and feelings to your partner and come to a resolution together.