I’m going with emotionally hurt is that ok?
"I’m going back to Republic City with Chief Beifong," Mako announced in lieu of hello as soon as he found Korra alone. He knew she’d just finished her training with Opal and they’d have a moment to themselves. "I just wanted to let you know."
Korra looked up in surprise, the briefest flicker of hurt crossing her features before she tampered the emotion down. “What? Why?”
"You seem to have things in control here, and with a whole city of metal benders, it’s not like I’d be able to help protect you. I’d just get in the way." He spoke in a matter-of-fact tone, as if she should already know this, but wouldn’t look her in the eye.
She frowned. “Mako,” she started, taking a step toward him.
He flinched and took a step back, “It’s clear to me I’m not needed here.” He shrugged. “I want to go back to the city.”
"What are you talking about? Of course you’re needed here." Korra stubbornly took another step forward and placed a hand on his arm. "I’ll always need you around."
"The Avatar doesn’t need anyone," he said, but didn’t step away this time.
"You know that’s not true," she said softly. "And even if it were, Korra will always need you. I thought we talked about this. Just because we broke up doesn’t mean you’re not still important to me. I still care about you. A lot. That won’t ever change.”
He swallowed, finally raising his gaze to look her in the eye. “You think that doesn’t make this hurt even more?”