I read your comment about how Harry feels envy than jealousy. And I want to ask you something. What's the difference between jealousy and envy? Isn't envy when you want something that someone else might have (like wealth or beauty), and jealousy is when you're afraid that you might be replaced by someone else? Because they have something that you don't? So, jealousy and envy go together right? I just want to know the correct definitions.
So I am making a super fine distinction in order to make excuses for an otherwise-unpleasant trait of my favorite character, but technically--
Envy is when you want something someone else has and you don’t. So if Steve has a cookie and Bob doesn’t, Bob might envy Steve. Bob might also envy Steve when they both have cookies, because he thinks Steve’s cookie is better somehow.
Jealousy is when you want to exclusively have what you have. If Steve has a cookie and Bob wants some of it, Steve might jealously guard his cookie. Steve might also be jealous if Bob gets a cookie of his own, feeling that his cookie-having superiority is being threatened.
This is a distinction that almost nobody makes in conversation, though. Like, normally you’d look at someone with a fantastic cookie and say, “Ooh, I’m jealous!” and anyone who came by and said, “No, technically, you’re envious” would rightly get things thrown at them.
Romantic jealousy implies that you think of the other person as your partner already. If it’s about someone who isn’t your partner, it reflects badly on you because there’s an assumed entitlement to that person associated with it. If it’s about someone who is your partner but the two of you haven’t made any (stated or implied) promises about exclusivity, then jealousy is a you-problem and not a them-problem, and you get to handle it like a big boy or girl.
I would absolutely characterize Ron and Hermione’s reactions to each other in book 6 as jealousy. In particular, they both thought they had an arrangement, and then each thought the other had violated it. (Ron’s was more out of line, for the record--they certainly didn’t have an arrangement back when Hermione kissed Krum, but we can see why Hermione thought they had one when Ron kissed Lavender.)
On the other hand, characterizing Harry’s chest monster in particular as jealousy is super unpleasant, because he had to that point made it clear to Ginny that they didn’t have an arrangement. I... think that was probably how it was intended, but I reject that reality and substitute my own.