It never says anywhere in the books, but in an interview JKR revealed, among lots of other post-canon stuff, that she ends up with Rolf Scamander (grandson of Newt Scamander). I like to think she and Dean had a thing for a little while...
aw crap I dont even remeber who newt scamander is
I think he wrote one of the textbooks. Ooh, Fantastic Beasts and Where to Find Them I think. But I might be totally wrong.
well i love this pairing anyways lol