Did Demi ghost Niall back in the day?

Remember those rumors that Niall Horan and Demi Lovato were going on secret Skype dates back in 2012? Well, it seems Demi is insinuating that things ended because Niall was a little overzealous. "I had a situation where I think somebody had an alarm set on their phone they would Skype me every time," Demi said when asked if she's ever had to ghost a boy. "I told them, 'Hey, I'm not interested, please leave me alone,' […] then I changed my number and ignored them." But why do fans suspect she's talking about Niall? She concluded her juicy tidbit by saying, "If you knew who it was, he's not a stalker." That's code for: He's someone in the public eye. Very interesting!