Well I believe that nothing lasts forever.
They fought too much recently. Maybe it was all the time they were spending together, maybe it was the fact that they were both meeting new people all the time. Whatever it was, it was putting a huge strain on their relationship. "I wish you just trusted me!" Blaine argued.
"How can I? It was your actions that broke us up for almost a year!" Kurt yelled.
"Scott is in my study group, he has a girlfriend!" Blaine yelled.
"He was still in your room – our room!" Kurt had crossed the room, heading for his jacket hanging by the front door.
"Where are you going?" Blaine asked.
"Out. I need to clear my head," Kurt replied.
"You can't just leave! Kurt, this is silly!" Blaine said.
"What if I want to leave? What if I just want to walk away from a fight?" he asked.
Blaine sighed. "Then go," he said.
Kurt put his jacket on, but instead of walking through the door, he leaned on it. "Maybe I'm overreacting," he said.
"You think?" Blaine asked.
Kurt half-chuckled. "He didn't exactly make my gay-dar go off," he said.
"Again, he's straight. Just in my study group," Blaine said.
"I guess I can deal with him being here, then. And I do trust you. It's just hard sometimes," Kurt said.
"I know," Blaine said. "Let's make some dinner. We can do some homework while we eat."
"Okay," Kurt said. They soon forgot about the fight over their delicious meal.