He was falling out of love. He was scared that that was the case. He loved you, but maybe not enough. You've been together for years. You waited for him when he was deployed, comforted him when he came back more scarred than before and supported him through his PTSD. So he didn't understand why all of a sudden he didn't feel the same.

There were more fights. More arguments, more nights were you two would fall asleep mad at each other when he used to go back to bed, apologize even if it wasn't his fault. He had hated going to sleep while mad at you. But now, he just didn't care. This was one of those nights. He had left the room to sleep on the couch. It was 3 am and he hadn't come back to make up and not be mad at each other.

He stared up at the ceiling. He was thinking about today. About the argument and about the nice woman he'd bumped into in the morning. He hated it. Thinking about someone else when he should be thinking about you.