How we cite our quotes: All quotations are from Star Wars: The Empire Strikes Back.
Quote #7
LEIA: I don't trust Lando.
HAN: Well, I don't trust him, either. But he is my friend. Besides, we'll soon be gone.
LEIA: And then you're as good as gone, aren't you?
Even in the face of serious danger, Leia shows concern about Han leaving. This represents a big leap forward for their relationship, as it's the first time Leia admits (or, at least, kind of admits) that she'd be personally affected by Han's departure.
Quote #8
[Han has just been tortured]
LEIA: Why are they doing this?
HAN: They never even asked me any questions.
After Lando's betrayal, Leia is reminded why she fell for Han in the first place. Although he's always ready with a sarcastic quip, he's also incredibly determined, loyal, and resilient.
Quote #9
HAN: Chewie, this won't help me. Save your strength. There'll be another time. The princess, you have to take care of her.
Although Han is literally about to be frozen into metal so he can be turned over to a giant slug-man, he still puts Leia's life ahead of his own. What a scoundrel, right? If that's not evidence of true love, then we don't know what is.