Horan, who began dating the Irish model in March, has been ignoring her, reported Daily Mirror.
"It is all over for Niall and Zoe - and it is completely because of his side of things. Obviously, it was always going to be hard to have an ongoing relationship when his job has him travelling around so much," a source said.
"But there's been no push from Niall to keep things going at all and has told Zoe it is over by completely blanking her."
With the 18-year-old beauty's career starting to go from strength to strength, the 'Little Things' hitmaker hasn't been in touch to over his congratulations or support.
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