Niall and Selena are friendly with each other but they don’t want to date each other. They’re not attracted to each other. And if they were attracted to each other (but they’re not), Niall wouldn’t want to hurt his friendship with Justin by dating Selena. Niall still has a crush on Demi Lovato, who’s been Selena’s friend for a long time. He wouldn’t ruin his chances with Demi by dating Selena.
That’s fine anyhow since Selena and Justin Bieber are back on as a couple! The duo were spotted at the Salt Lake City airport recently where they shared kisses before heading their separate ways for the holidays.