"Charli and Jack Do America" tour began earlier this summer. A second leg was added a few weeks ago and was supposed to open on September 14 in Boston, MA.
The singer announced she is no longer able to play the remaining dates on their "Charli and Jack Do America" tour, in a Facebook post.
"These personal reasons include the fact that I need to be creative. Artists tour for a really really long time and I have been on the road for a while now, probably not as long as some, but for me it feels like an eternity. I am struggling to create whilst I'm on the road and that is making me unhappy."
She also praised Jack Antonoff and his Bleachers bandmates, and apologised to disappointed fans. Despite the cancellation, she will still perform at the frontman's Shadow of the City Festival in New Jersey on September 19.
"(S)ince I found out my team and I have been scrambling to try and figure out a way to continue with the tour on our own, but it has been made clear that reworking the tour at this late stage without charli is not realistic," he wrote.
The British beauty is still expected to perform at Antonoff's Shadow of the City Festival in New Jersey on September 19 following the cancellation.