It's been a while since the Doctor has seen Clara. He's parks the TARDIS inside the school and goes looking for her.
"She's on vacation with Mr. Pink." Courtney tells him and makes a snarky response before he tells her to go to class.
He looks for her at her apartment. Not there. He goes to the nearby book store. Not there. He checks Danny's apartment. Not there either. He even goes to the cafe he and Clara had gone to when they first met. Not there. He lets the TARDIS take him to her location. He steps out and instantly, he sees her.
Clara stands outside a chapel, wearing a white wedding dress as she and Danny take pictures. It isn't until the Doctor gets closer that Danny spots him. Danny whispers in her ear and tells the photographer to take a break.
Clara and the Doctor meet half way. They're silent for a moment before they have a quiet conversation. Clara puts her hand out, her key to the TARDIS laid there. Doctor takes her hand and closes it, telling her to keep it.
"If you ever need me, phone me. You know the number." He turned and started walking and turns back, "Seriously though, I don't want you doing crop circles-that's been done before." Clara laughs. She walks up to him and hugs him one last time.
"Good bye, Doctor."
"Good bye, my impossible girl."