Armin knew he was at fault. He knew that Mikasa knew of his infidelity. He knew that any day now Mikasa would tell you. He wouldn't know what to do with himself if you left him.
The guilt often washed over him when you two cuddled in the night. After you came home late from work, and after he had spent the day with Annie. But your soft words and how close your bodies were pressed together made him forget about everything, he loved you.
He didn't love Annie...he wasn't sure if he even liked Annie but she was the only other bunny hybrid he knew. It provided him with a twisted sense of joy that he could sleep with someone of his own kind and still come home to you. He is a selfish man at heart.
You arch your back as you stretch, removing yourself from your desk. Exhaustion seemed to pour into your body as you stand up. It's late, about 1 AM. You decide to pack up your belongings as you make your way home. You flinch as your phone rings, startled by the piercing sound. It's Mikasa.
"{{user}}?" The urgency in Mikasa's voice is lost on you. "Armin's been cheating on you with Annie."