The 21-year-old singer was caught wiping away tears during the band's performance in Indonesia on Wednesday, the same day his 22-year-old bandmate officially announced he was quitting the British boy band.
Harry took to his Twitter on Wednesday with a simple message to his obviously devastated fans.
"All the love as always. H" he wrote.
"Been a crazy couple of days but know that we are going to work harder than ever to deliver the best album we've ever made for you guys!" he tweeted. "Your support has been incredible, truly incredible so thank you so much!"
"Sometimes strength is not defined by numbers," he tweeted on Wednesday, obviously referring to the band now continuing as a four-piece. "As always you the fans have shown your amazing support to all the boys. When you have great talent great things happen."
