A source has since told The Sun Online: "Duty of care is the most important consideration on shows like this and as soon as he felt unwell, ITV would have had a discussion with him about leaving".
A single Niall then coupled with newcomer Georgia after a sizzling first date. It's a shame as he was doing really well and taking the show by storm.
However, it looks like you will have to keep guessing over the reasons why exactly he left the villa, as Niall has only retweeted a number of reports revealing his shock departure to fans, including some from his celeb fans.
'For personal reasons unfortunately he can't continue or come back to the Villa, ' he was seen telling his fellow contestants on last night's show.
Georgia Steel, 23, who was coupled up with the Love Island contestant before his exit, admitted: "Obviously I was coupled up with him so obviously I came closer to him than most people here but it wasn't just that".
This latest showdown could well have repercussions for Adam, with a recoupling coming up that will put the girls in charge of who they wind up partnered with, and we all know what happens to Islanders who don't get picked... He's such a great guy.
'He was actually my friend, my buddy'.
The reality star was the first boy into this year's villa and was instantly paired up with Kendall Rae-Knight, 26, who became the first Islander dumped from the series last Friday.
Before entering the show, he said: "I am looking for love mainly".
This year's series kicked off on June 4 - and if you're going to survive the summer, understanding the world of Love Island is now a pre-requisite.
Love Island 2018 airs tonight at 9PM on ITV2.