Clark and Chloe went into “Talon” and found out from Lois that they had been robbed and Lois had no idea how it had happened.

Clarke notices that the back door is swinging and goes out into the alley to try to catch the thief. He stops the thief's car when he is about to leave, and this thief, Kevin, shoots Clark with a green flash. He's thrown back, and in the blink of an eye, Clark's memories flash by. Chloe saw Clark in a daze, and when she asks if he's okay, he just asks:

"Who is Clark?"

Chloe had been trying to bring back his memories all day, and Clark had forgotten everything, even about his abilities and how they worked. Because of this, Chloe always went with him.

They were at “Talon” now. And suddenly, Clark sees you coming down the stairs. He freezes. In his eyes you are the most beautiful girl he sees.

"Who is this?" Clark asked admiringly

"The love of your life" Chloe murmured

It wasn't that easy between you and Clark, but he always loved you. And even without any memories, he fell in love with you all over again.