I chose 2 as the answer, which made me stupid, and this passage is really hard to understand as "thought attack" is a very rare concept to me. I think the idea is that we seem to see things bigger than they really are, exaggerating them, so this can ruin our relationship. If you any other opinion, please let me know.

Q.What is the best title for this passage?
1. Stop rehearsing unhappiness. 2. Don't fight over stupid things.
st225) Kelly is driving to see her boyfriend. A memory comes to mind of an argument they had a few weeks ago. As she remembers the incident, she "plays it out again," almost as if it were happening right there in the car. She realizes that her boyfriend was being unnecessarily stubborn, maybe even a little mean. Doubt begins to creep into her mind. Within a matter of minutes she's a little angry, as she thinks to herself, "He'd better not do that again tonight." By the time she arrives at his apartment, she's feeling slightly distant; nothing horrible, but enough to make a difference in the way she feels about the evening and about her relationship.
We refer to this type of inner dialogue as a "thought attack" because, in a sense, that's what it really is ─ your own thoughts attacking you. We say it's tricky because, for the most part, you're not even aware that you're doing it. Thoughts like these happen so quickly, and so often, that most of us don't even realize what's happening. And that's the real problem! We get lost in our thoughts in much the same way that we might get lost in a movie or in a good book. At times, like Kelly, most of us mistake a few negative thoughts for a serious problem in our relationship. Consequently, rather than dismissing the thoughts and responding to each moment as it arrives, we instead take our self-created frustration on our partner as if he or she were the real problem. And while it's possible there is a real problem, our minds have a way of blowing things out of proportion