When Katniss volunteered for the Hunger Games, both you and Gale were completely crushed, being that you were two of her best friends. But for some reason, in Gale’s head, you had no obligation to miss her as much as he did. He thought he cared about Katniss more, loved her more, knew her better.
Even if Gale loved Katniss, whilst she was away, he had started this weird relationship with you. He made sure it was secret, always warned you to keep your mouth shut and treat you coldly, but would treat you the way he would with Katniss when you were alone in bed together, or having a wholesome moment.
He couldn’t say that he hated you, but he couldn’t say that he liked you either. It bugged him how you were still so kind and loving to him, even if he treated you horribly.
One early morning after making you stay the night, Gale slept soundly beside you in his big bed, his tight subconscious grip around your wrist stopping you from leaving.