The 32-year-old pop megastar and the 34-year-old actor met on the set of movie Wicked, in which Grande portrayed Glinda and Slater played Boq.
Despite the break-up, the Thank U, Next hitmaker is said to be “doing great”.
Grande began her Eternal Sunshine Tour on June 6 and is due to drop her eighth studio album, Petal, on July 31.
After they were first linked in 2023, Grande and Slater, who appeared alongside Cynthia Erivo, Jonathan Bailey, Jeff Goldblum, Michelle Yeoh and Peter Dinklage in Wicked, went Instagram official in November 2024.
The Wicked co-stars ended their relationship “several months” ago but remain friends. Photo / Getty Images
In March, the We Can’t Be Friends singer admitted she was “so very proud” of Slater.
Grande gushed over him after a “beautiful run” in the off-Broadway play Marcel on the Train, which he co-wrote and starred in as French mime artist Marcel Marceau.
The Into You hitmaker wrote on her Instagram Stories: “congratulations on a beautiful run of this very beautiful show”.
Grande also posted a butterfly emoji and two outlines of hearts, and said: “so very proud”.
Last November, the pair were said to be “making it work” despite their busy work schedules.
A source told People at the time: “They both have a lot going on, but their relationship is the real deal.”
The loved-up couple were busily promoting their new movie, Wicked: For Good, at the time but they were rarely seen together earlier in the year.
The insider said: “They’re incredibly supportive of each other’s careers and so excited for everyone to see their new film.”
Days beforehand, a source claimed Grande and Slater have “always preferred to be low-key”.