According to Rowling - yes, but they didn't "end up" together because Rowling always hated Pansy, and saw her as an anti-Hermione. I think she was quite annoying too...
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hmmm anti-hermione? could that be leaning towards ड्रमायनी (in subtle way?)
I don't think Draco and Pansy were ever in a monogomous relationship, या any relationship at all; I don't see Draco as the type to tie himself down to one girl. I bet they did have a one night stand once या twice though.