The Little Mix singer had recently started dating the handsome actor but called off their romance when she decided there was no spark between them.
A source told MailOnline: ''In order to commit to someone at this busy time - she'd have to be really into them. It's a big commitment to date someone whilst you're constantly on the road - it's hard - and Perrie just wasn't really feeling things with Luke.
''There wasn't that spark between them, so she's told him there won't be any romance between them moving forward.
''Perrie went on a few dates with Luke over the last few months - it wasn't serious but they were getting to know one another.''
And Luke, 26, has stopped following Perrie, 23, on Instagram.
Perrie has now decided to focus on her career, after the success of Little Mix's latest single, 'Shoutout To My Ex', widely believed to be a message to Perrie's former fiancé Zayn Malik.
The insider added: ''Perrie has called it off as she is so busy with Little Mix promo. She has the single out globally now at number one - and the album coming - followed by an international promo tour - then a US tour with Ariana Grande.''
Perrie and Zayn dated for four years after they met on 'The X Factor' in early 2012 and it wasn't long before they got engaged.
But, despite planning their wedding and looking at buying a house together, Perrie was left heartbroken when Zayn reportedly ended their engagement via text message last year following claims he'd cheated on her while he was touring with One Direction in Thailand.
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