The "Without Me" singer took to Instagram to clarify her single lady status, denying there's anything more than friendship between the two.
"I just had a ground breaking idea. What if...we let female artists...have friends...without assuming that they are sleeping together?" she wrote.
"I know I know. It’s like, completely ambitious but like, imagine if we like, tried ?" she continued.
While Halsey says it's not romance, she doesn't actually mention Mayer by name so ... ?