I keep thinking about the conversation that ended, every afternoon.

There’s nothing left to say to the person I broke up with, but every afternoon I can’t focus on work.

Scenes

The work is right in front of me, but my thoughts return to that conversation. — Every afternoon since the breakup, I’ve struggled to focus on work. I stop in front of the screen, picking up our finished conversation again in my head.
I keep looking for answers, even after it’s over. — Maybe there are still things you want to say to them. Or maybe you’re replaying the conversation to understand why it ended.
The conversation in your head goes on alone. — When you can’t hear their answer, your memories and guesses fill in the blanks. So going over the same part again won’t give you a new answer.
Separate today’s remembered words from your guesses. — Tonight, write down one line you remember and one guess about what it meant. You don’t have to find an answer; just notice whether the two are different.
Even when the thoughts return, today goes on. — The same conversation may come to mind again next afternoon. You don’t have to find a new answer every time.