The duo, who have been friends since they were kids have been meeting and clicking pictures since then and their latest meeting came after the band's concert in the UK at the Metro Radio Arena, reported E!online.
The 21-year-old singer's ex and her friends attended the band's concert and met him backstage.
Abigail's friend, posted a photo of the group.
"Backstage with Haz #onedirection #mondayfunday," she captioned the picture.