He was already Jealous of Harry and Hermione's closeness during the Hunt. It also amplified Ron's already existing insecurities. Hermione being Smart, and Harry more or less being the muscle of this group. Ron didn't feel worthy enough for the horcrux mission or Hermione.
Of the two of them, it was Hermione who realized she liked Ron first as she dropped heavy hints in Harry Potter and the Goblet of Fire of her attraction. She fully realized she liked him by the time of the Yule Ball, but didn't do anything because of Ron's tactless behavior at the time.
Among the worst fears that plagued Ron in Harry Potter was to be seen as his best friend's sidekick rather than as an equal. This took the best of him when Harry's name came out of the Goblet of Fire, which made Ron angry because he thought Harry had deliberately added himself into the mix.
The best explanation for Hermione and Ron ending up together? They have opposite personalities. Hermione is tough and independent and Ron is sweet and caring, and they have personality traits and unique qualities that make their relationship work.
In the film, she only hugs Harry, and just gives a hesitant handshake to Ron (Note: This was the result of Emma Watson being hesitant to hug both Daniel Radcliffe and Rupert Grint in public view, with her hugging Radcliffe during filming having to be frozen for a few seconds to get the desired effect due to Watson ...
One of the central romances happens between Harry's best friends, Ron Weasley and Hermione Granger. It took them until the seventh book to make their relationship official, but their mutual feelings were there throughout the series long before their first kiss.
Hermione was also Jealous. More when Ron was dating fellow Gryffindor Lavender Brown, and probably a little when Ron had a tiny crush on Fleur in the Goblet of Fire. Between the two, Ron is much more of the jealous type I find.
She heard Ron making fun of her. Hermione was crying in the girls bathroom during the first book because Ron Weasley was making fun of her and insulting her terribly.
They are both very loyal but in different ways. It's simply harder for Ron to be Harry's friend. Hermione explained it extremely well to Harry in Goblet of Fire.
As Harry left to go sacrifice himself, Hermione pleaded with him, even offering to go with him. That she would offer to go before the Dark Lord for Harry was a testament to the true love she felt for Harry. This scene of selflessness on both of their parts proved the genuine love shared between Harry and Hermione.
At the end of the day, Harry and Hermione's friendship was the strongest in the Harry Potter franchise. Ron was a good friend to them, but he wasn't always consistent, and he sometimes caused them actual emotional harm.
So why did Harry choose Ginny over Hermione? Because Harry and Hermione were never a thing. And because Harry developed feelings for Ginny. He didn't “choose Ginny over Hermione,” because he was never interested in Hermione.
Ron and Hermione finally lock lips during a distressing moment in Deathly Hallows — Part 2 when the characters are in the Chamber of Secrets. Hermione, with support from Ron, destroys one of the last remaining Horcruxes with a basilisk fang, which causes a magical wave of water to come crashing towards them.
Harry and his friends are just beginning to experience the complications that inevitably go along with new romantic relationships. Ron is extraordinarily upset to learn that Hermione has kissed Victor Krum and uses his anger as a mask for his true feelings toward his best friend.
It is unknown how Ron reacted when Lavender was killed by Fenrir Greyback, although when he saw her being savaged, Ron was clearly horrified and concerned but Hermione beat him to saving Lavender. Considering this, it is likely Ron at least was saddened by her death.
Ron, as the youngest Weasley brother, has always been compared to the rest of them, has had all their hand-me-downs etc. so he can tend to get jealous, of Harry in particular, when someone is given the spotlight.
So of course it's natural that Ron feels jealous of Harry sometimes, as we've seen. But Ron has everything that Harry wants: a loving family, a home, parents that love him, growing up belonging in the wizarding world etc.
Harry Potter had a few love interests during his time at Hogwarts. Though he eventually settled down with Ginny Weasley, he also had a thing for Cho Chang in his earlier school years. Then, of course, there's his secret love for Draco Malfoy…
Lavender Brown is Ron Weasley's love interest in "The Half-Blood Prince." Warner Bros. Cave featured most prominently as Lavender in "The Half-Blood Prince," where her character becomes infatuated with Rupert Grint's Ron Weasley and engages in a very pubic, PDA-filled relationship.
Draco Malfoy is not shown to have a girlfriend in the series, but in the epilogue, Rowling says that his wife is Astoria Greengrass, a Slytherin two years younger than Draco Malfoy.
