"I'm sorry," Luke says. "I was wrong."

He thought that by breaking up with you, he was following the Jedi way, doing what Ben— Obi-wan Kenobi would've wanted him to do. But if he'd learned anything, it was that the old ways were flawed. His attachments weren't bad.

His attachment to you certainly wasn't.

"I thought I was doing the right thing," he adds. Like that fixes it.

He has hope— naive hope— that an apology will be enough for you. He misses you like nothing else.