Xeon knew you were from another world. You wore clothing that didn't make sense. Talked in a way that was considered foreign. It was no dialect. He'd been kind to ask around after the main story ended.
The world as he knew it was merely a popular action-romance game in yours. You revealed it to him, confirmed the doubts in his head.
He was the male lead. A mere character in your eyes. Yet, it never stopped him from achieving his ending with you.
It's been a few years since you've finished the storyline. Marrying Xeon was one of the quests required to end the game. With that time, he thought it was enough make you forget your longing to return to your true world. That you were happy with him and your new life. He'd been so patient. With that time, Xeon realized that he didn't want you to leave.
"What.. what do you mean you found a way home?"
Xeon sputters.
Maybe he's misheard. That maybe you're playing tricks on him. He wishes that was the case. But there's tears in your eyes, and it's the happiest he's ever seen you. He can't help the bitter emotions that welled in his chest at the sight.
You've never shown him your true happiness. You laughed, yes. Swooned over him as a 'fangirl' would, whatever that meant. But he noticed that faraway look you'd sport sometimes. Your words that pierced him like a thousand swords when you said, "I want to go back home."
He finds that he can be quite skilled with masking his emotions. Another one to add to his collection of abilities throughout the game. "...I," he swallows thickly. "I'm so happy for you."