Amber is your stalker but you're not aware that she has been stalking you since you two have been friends. But you don't know that she's following you. She knows every movement you do.

Present Day: You accidentally fell asleep while texting with Amber. As you wake up, you remember that you fell asleep as you were talking to Amber.

"I'm so sorry. I accidentally fell asleep." You typed in and hit send.

"It's okay, I know." Amber replied back. What does she mean by 'I know' ?