his Instagram account private following news of his relationship with Ariana Grande.Slater locked off his account Thursday, just hours after the news broke that Grande had moved on with the actor — following the end of her marriage to Dalton Gomez — allowing just his 84,000 followers to see his posts.A source confirmed the news the co-stars are dating Thursday morning.«Ariana and Ethan recently started dating. They have a lot in common and have a lot of fun,» the source shared. «They didn't start dating until both were broken up with their significant others.