Presumably because he loved her. They get married after the series so it isn't explored in the book.
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No, he was killed in the final battle at Hogwarts.
Arthur, Molly, Bill, Percy, George, Ron, Ginny.
Ginny Weasley.
Bill Weasley is the one who marries Fleur. They meet at Gringotts where he works and where she's temporarily working to improve her english.
He marries Ginerva Weasley (known as Ginny Weasley).In the last book a chapter titled 19 years later, it tells us how Harry and Ginny marry and have kids named Albus, Lily and James.In the epilogue to the last book he is married, and has three children. One of them has already been in Hogwarts at least a year, which would indicate that they got married sometime in the first 5 years after the Battle of Hogwarts.