The story never states that Neville gets a girlfriend. However, in the movie Neville and Luna do seem to have a bit of a relationship, or at least the beginnings of one. But there is a show or short documentary or something called The Life of J.K. Rowling I believe. It states what becomes of some of the characters in J.K. Rowling's mind.
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Neville Longbottom became the Herbology teacher at Hogwarts.
Neville Longbottom? Augusta
No, Neville married Hannah Abbott and Luna married Rolf Scamander.
No, Neville survives through to the end of the series.
Neville longbottoms date to the Yule Ball was Ginny Weasley