In Deathly Hallows part 2, we see them kissing proving they were in love and later they married. But in Harry Potter and Half Blood Prince, we see Harry trying to impress another girl in the hotel in the start of the movie. So were they not engaged in Half Blood Prince?
closed as too localized by KeyBrd Basher, Ankit Sharma, Origin, PriestVallon, Mistu4u Jan 22 at 7:54
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Harry Potter's earlier love interest was Cho Chang. She was dating Cedric Diggory in Goblet of Fire and later dated Harry during Order of Phoenix. They also share a kiss before the Christmas break, in the room of secrets.
However, she is torn between the memory of Cedric and her emotions towards Harry and thus their relationship never stabilises. Later in Half Blood Prince, Harry starts to see Ginny, for who he always had a soft corner in his heart. They share a kiss right after Gryffindor wins the Quidditch Cup.