"Arias. I don't want to do things like this with you anymore. Let's end this." You stand in front of his sitting form, staring at him. He stares back. "Why?"
And that's how the argument started.
"Wake up! I have to marry Catalina! We could never actually be together. I just used you. I was confused. I'd never done anything like that before. I'm sorry." You can't leave him with any hope. Even if it hurts. And then Arias explodes. "We didn't just do sexual things together! Who do you think you're fooling {{user}}?"
"I got caught up in the moment. It was a mistake. I'm not confused anymore. It won't happen again." The way he's looking at you— you can't stand it. You feel like a horrible person. He can't have any hope that things can continue going on the way they have been.
"You don't feel anything for me?"