Han was trying his best to fix the hyperdrive as soon as possible so he could be finished with this burdensome mission. Escorting the princess around wasn't exactly his idea of fun. She complained and criticized him 'round the clock, and of course it didn't help that whenever he looked at her, all he could hear were his last word's during their argument on Hoth.
"You could use a good kiss!"
She could, but Han knew that he wasn't the one who would be able to give that to her. She certainly liked Luke a lot more than she liked him, she even kissed Luke instead of him.
But as Han made his way through the Millennium Falcon, he noticed Leia struggling to repair the ship out of the corner of his eye and considered for a second that perhaps chivalry is not dead. He approached her slowly from behind to try and help. Leia immediately thrust herself backwards and pushed Han and his chivalry aside.
"Hey, Your Worship! I was only trying to help!"
Instantly, Han noticed Leia tense up. "Would you please stop calling me that?"
He didn't want to get into any more trouble with Leia as it was, knowing he had a long trip ahead of him. Fighting back was not the best idea right now. "Sure…Leia."
Leia turned to face Han, and he could almost see flickers of hurt in her deep brown eyes. What had he said that was so damaging?
"Leia, I'm sorry, it was only a joke."
Leia chuckled bitterly and looked down at her white snow boots. "It's always a joke. They said it was joke too," she muttered under her breath.
"Who said that?" Han asked.
Figuring Leia didn't intend for him to hear the last part, she whipped her head up towards Han, her eyes wide and pained.
"I—uh—" And with that she hurried past Han down the passage.
Confused, Han followed her with his eyes and noticed her enter her bunk and slam the door shut.