Barry POV. 

"Caitlin! Did you see Sebastian?"

"Oh he's probably with Cisco."

"Nope, Cisco came in already."

"Did you check his room?"

"Sebastian! You in here?" Caitlin walks in first then she stops and picks up a note. "I'll be gone for a while, please don't call or look or me, I'm fine." She read the note. "Barry." She looses her balance and I catch her. "Barry he's gone."

"What do you mean, he's gone?" She wipes a tear. 

"He was talking a lot about his Earth, his home."

"But he just started dating you!"

"I have to go." She grabs the note and walks upstairs. 

"Caitlin!" She gets on the elevator, I could get her, but she deserves some time. 

"Hey everyone gather!" I shout." I run everywhere before going back to the cortex. "I'm sorry to say, uh Sebastian went home, as in his Earth, home."

"No, he is not, I did not- he stole a breaching device didn't he?" Cisco pouts. I nod. 

"He's gone?" Iris looks at me. "It's my fault isn't it?" She slides to the ground. "Barry he's gone and it's my fault." I give her a tight squeeze. 

"He's gone." 

Caitlin POV

I quickly got to my apartment and locked the door. "Oh god." I sit up with my knees pressed to my chest. "Sebastian, why?" I whisper in between breaths. Tears fall from my face. "Sebastian, how could you leave me?" I let everything out before I get up and put my keys down. I look at the plate where I usually keep my keys. I see a note. 

'Caitlin, I'm so so sorry, I don't know if I'll be back soon, but I will come back. Please forgive me, please, when I come back, I will have a plan, I promise. I'll be back before it happens, I'll try my best to be back in a month.' 

My hand shakes and I drop the note. 

"I forgive you, please come back."