She had harboured affection for Harry since her first year at Hogwarts. At the end of her first year, her affections only intensified when Harry saved her from the influence of Tom Riddle's diary. Ginny still maintained hope that Harry would return her feelings, she started dating Dean and a few other boys.
Why did Ginny Weasley date Dean Thomas? Because Harry Potter wasn't available and she liked Dean Thomas well enough to date him. See, people usually date people because they like them—that's how it works.
As far as the reader is told she had one date with Neville and then dated two guys in about 2 years. But the reason that Ginny dated other guys was because Harry showed no interest in her. She didn't “choose” him.
Ginny Weasley never 'used' her boyfriends Michael Corner and Dean Thomas to make Harry jealous, nor did she try to 'show him what he was missing out on.
In the first argument mentioned in the books, they had a row because Dean had found Harry getting hit by McLaggen very amusing when Ginny had not. The second time they argued was because Ginny thought Dean always tried to help her climb up the Portrait Hole like she couldn't pass it herself.
The Life of Dean Thomas (+ Dean and Ginny’s Relationship)
Why did Dean break up with Ginny?
Thus, luck was on the side of Harry, who had developed an interest in Ginny, and she thought Dean was trying to push her through the portrait. This row led to their split.
The only romance Dean has during the series is with Ginny Weasley, but they obviously don't get married because they break up and Ginny ends up with Harry Potter. Dean/Seamus is a popular ship with fans (and the two actors who portrayed them in the films), but they're not canon.
After years of build-up, Harry finally starts to have feelings for Ginny in The Half Blood Prince - and one of the first moments he realizes it is when he smells Amortentia, and it smells like 'something flowery he had smelled at the Burrow'... Ginny's hair!
In the book, Harry kissed Ginny after Gryffindor won their Quidditch game, whereas, in the 2009 movie, it was Ginny who boldly kissed him, just before the pair disappeared into the Room of Requirement.
Ginny starts dating Dean at the end of her fourth year, around June 1996. They have a rocky relationship since Dean constantly tries to help Ginny in small ways and Ginny wants to be more independent as she grows older.
Harry's love for people even made him offer Voldemort a final chance of redemption. Harry Potter's love for Ginny Weasley (his future wife) made her the last person he thought about before facing his own death.
In conclusion, Ginny didn't sleep with Dean. Shocking revelation, I know. It's made pretty clear in the books that Harry is the one person she allows to break into her emotional sphere something that is also reflected in how she is way more comfortable when touch comes from him rather than Dean.
She survived the war and eventually married a muggle Mr. Campbell and had a daughter named Erin. Even though Cho seemed very innocent and kind, she still couldn't get over the fact that Cedric Diggory was dead and Harry Potter, her new crush, had been right beside Cedric when he died.
Dean and Seamus were best friends throughout the series similar to Harry and Ron, and they could have easily dated, too even if this was just a side relationship that wasn't a focus of the story.
Harry contributed to their ultimate break-up by bumping up against Ginny when she and Dean were going through the portrait hole while under his Invisibility Cloak and after having taken Felix Felicis.
Cho's lingering feelings for Cedric and a lack of chemistry between her and Harry contributed to their breakup, leading to Harry ultimately ending up with Ginny Weasley.
In the first couple of books, Ginny simply has a crush on Harry, and gets very nervous around him, while Harry does not return the feelings for her, but still likes her as a friend.
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…
They begin dating in The Half-Blood Prince but Harry broke up with Ginny because he freaked Voldemort would harm his girlfriend to get to him. (In the films, they remain together).
Harry's first crush Cho Chang was perfect on paper; she was a great Quidditch player and a kind soul, but the two had no compatibility beyond that. Harry was besotted with Cho, who only had eyes for Cedric at first. When Cho tried to pursue a relationship with Harry later, she was clearly not over Cedric's death.
Her middle name, Luna, is a tribute to Luna Lovegood, a good friend of her mother, during their time at Hogwarts. This naming choice reflects the deep respect and affection Harry and Ginny have for these two individuals.
Rowling elaborated on Ginny's future after the release of the book, saying that after leaving Hogwarts, she joined the Holyhead Harpies and, after spending a few years as a celebrated player, retired to become the senior Quidditch correspondent at the Daily Prophet, and to start a family with Harry.
