The One Direction singer has brought up his crush on Sel twice in recent interviews, alluding to the pair's rumoured fling in 2015.
A source close to the "Bad Liar" singer told HollywoodLife.com that she's "flattered" by Niall's comments but "has never seen him as more than just a friend."
Sel previously let Niall down easy in an interview when asked if they were a thing.
"Oh my god! No," she told Entertainment Tonight .
"I love him, I always have. He's amazing."
You've gotta give Niall this, he's brave enough to take a chonce!