Joel is in bed remembering his talk with Frank. The memory slowly disappears until it's finally gone.
Then Joel's at Carrie and Rob's house, explaining this thing that just happened. He and Clementine haven't been doing so hot, so he goes and gets her an early Valentine's Day necklace to make up for it.
But when Joel goes to Clementine's work to give it to her, it's like she doesn't even recognize him. She's also kissing some total stranger named Patrick.
We see Joel leave the bookstore, and that memory fades, too—if it is a memory at all and not the present. What time we're at is very unclear.
Then the big news happens: Rob shows Joel a slip of paper from Lacuna that says Clementine has had her memory of Joel erased. Rob says no one should mention this to her.
Joel is not happy. Things are starting to make both more and less sense.