I mean its not just one kissing scene, and she clearly is kissing luke because she likes him, or have you forgot this scene? https://youtu.be/2ZNlDnG-azE?t=92
That scene has already been addressed, and it doesn’t really count. It’s less romantic, and more just taking care of someone who’s basically half-dead. Leia’s feelings are fully with Han at this point.
I do get that the plot doesn’t require the “love triangle” (and I know its not really one but what else do you call it) but like I said, its not about what the audiance knows, its about Han’s point of view. As far as he is concerned Leia has been stringing him along. The far worse part of that whole sequence is the whole kidnapped princess thing, where the ewoks randomly pulls a forest dress out of their ***es. I mean that whole think feels more like the Princess Bride than Star Wars.
Anyway Leia and Luke, behave like more than just friends and I feel Han would definaitly be the kind of fly-boy to overreact in that situation.
But why would Han think Leia has been stringing him along, if they already admitted that they loved each other. The so-called “love triangle” was completely resolved in the carbonite scene, no need for Han to suddenly be jealous again.