In her sixth year, she joined Dumbledore's Army against her parents' wishes and began dating Harry Potter. However, Cho's best friend Marietta Edgecombe betrayed the D.A., and Cho and Harry's relationship fell apart. Cho remained loyal to her school and to the D.A., returning after she had graduated to participate in the Battle of Hogwarts. She survived the war and eventually married a Muggle.
At the beginning of her seventh and final at Hogwarts, Cho caught a glimpse of Harry on the Hogwarts Express. She did not speak with him, instead hiding back in her compartment with Marietta Edgecombe. The two had almost no interaction for the rest of the year; according to Harry, they simply "fell apart", too embarrassed to even look at one another. That year, Harry began dating Ginny Weasley while Cho dated Michael Corner, who ironically had previously dated Ginny, and who offered Cho comfort over the trying events of her fifth and sixth years.
Cho: "If you'd like to see what the diadem's supposed to look like, I could take you up to our common room and show you, Harry. Ravenclaw's wearing it in her statue."
Ginny: "No, Luna will take Harry, won't you, Luna?"
Cho demonstrated her loyalty by reuniting with other members of Dumbledore's Army to join the battle against Voldemort and the Death Eaters when they attacked Hogwarts. She appeared amicable and friendly with Harry, offering to lead him to the Ravenclaw Common Room in search of Rowena Ravenclaw's diadem. She seemed disappointed when this was fiercely denied by Ginny, which indicates that she still had some feelings for Harry. Cho fought in the Battle of Hogwarts and survived the war.
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