They were both at fault for not staying in contact, Loki more than Thor. At least there had been reasons that Thor had been unable to stay in touch. Loki had simply tried to distance himself on purpose.

I'm sorry.

After he signs it he reaches out to grasp one of Thor's hands and give it a light squeeze, still feeling too weak for anything more than that. His hand slips away when Thor asks another question and Loki shrugs.

It was alright. Kept me busy. Distracted.