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Although that doesn't mean that his reaction would be calm and level-headed if Ron and Hermione really cross the line into actual romance in book 7... Here's too hoping that it wouldn't be!
I don't think we'd get jealousy out of Harry even then. I'm more along the lines of thinking it'd be like in Emma. Emma isn't insanely jealous when she finds out Harriet loves Mr. Knightley and thinks Mr. Knightley likes her back, au contraire, Emma feels an overwhelming sense of despair. She suddenly realizes that she loves Mr. Knightley, but is about to lose him when she realized he was always there for the taking, only her foolish blindness kept her from realizing what she had. Emma can't bear the thought of Mr. Knightley being married to anyone else, and grows more silent, and sad after this realization, not insanely jealous. Emma can't bear the news, it would break her heart in two.
This is what could happen:
This scenario takes place after the defeat of Voldemort.
Harry talks with Ron, who after a nasty injury from prior to the battle with Voldemort is healing in a room at St. Mungo's. And he's going on about a girl that he just realized he loves, and since Harry suffers from the delusion that Ron likes Hermione automatically assumes that Ron is talking about Hermione. However Ron remains ambiguous as to who is the girl he means. Hermione then comes in and Ron says how convienent and that he wants to ask Hermione something, Harry leaves, thinking Ron wants to ask Hermione to be his girlfriend.
Harry goes a little depressive and withdraws, suddenly realizing that he's about to lose the thing he always had but was too blind to see.
(In my mind Ginny at this point is either dead or ran off with either Draco or Dean, Dean is who I think most likely at this point... fits with the Henry Crawford parallel [If you want to know that just ask me... I'll be glad to run through Mansfield Park once more to prove it could happen])
In walks Hermione, coming to tell Harry something, because besides wanting to check on Ron that's why she originally went into the room.
She starts off the conversation though by thinking Harry's upset because he just heard that Ginny ran off with someone else. Harry surprises Hermione by saying that's not what's causing him grief. Hermione then, embolded by this info says that she can't stand it anymore and has to tell him something
Harry thinks that Hermione's going to tell him that she and Ron are together, and begs her to not say anything. Hermione hears this and hurries off, obviously hurt. Harry feeling like a heel follows her and asks for her to continue, and that as a friend he should be able to hear whatever she has to say (as he steels himself for the worst: She's going out with Ron).
Hermione goes off on the friends comment.
"Just as friends? Just as friends then... is that how you see me? Tell me Harry, don't I even have a chance?"
She then goes into admitting why she originally came, and Harry just sits there dumbfounded. Hermione taking his silence as meaning no, gets up and Harry stops her, says that he does like her that way, and explains how he's been suffering from a delusion.
"Ron? You thought I was in love with Ron? Harry, come with me, Ron has something to tell you"
Go in and confront Ron,
"You thought I liked Hermione? I'm sorry but that's just... disgusting! No offense intended Hermione, but I think of you a lot like my sister" said Ron
"None taken" said Hermione
"But you said you just realized that you loved a girl" said Harry
"I was talking about Luna" said Ron sheepishly
"What?! Luna?" asked Harry
"Yeah, ever since that time she did the Quidditch commentary she's sort of... grown on me. And since I've been cooped up here for the past few weeks, she's been visiting me everyday, while you were finishing Voldemort off. I tell you, if it hadn't been for her I would have gone crazy being stuck in here mate. She really knows how to make a bloke laugh" said Ron
"But what was it that you wanted to ask Hermione?" asked Harry
"Well after Lavender I really don't... uhh... well..." started Ron
"He wanted to know how he should ask her out! Ron, all you have to do is pluck up that courage you have in there and just ask her out! Stop doubting yourself! I doubt she'll refuse you" interupted Hermione
"I hope so" said Ron
That's my version of how it'll happen. Yes it's heavily based on what happened in Emma, but hey, I think it'll be something along those lines.
~Salamon2