A source close to Matthew confirmed that Billie Eilish ended her relationship with him recently. In an Instagram story, he responded to the Billie fans who accused him of cheating. "The fact that thousands of people take time out of their day to write the most heinous things on someone they will never know is the most cowardly thing you can possibly do," the actor wrote. Matthew directly addressed the cheating rumours, writing, "Nobody cheated on anyone. Relationships end. Creating rumours and LYING on the internet is dangerous." The two first sparked romance rumours in April 2021, when they were seen together during the Happier Than Ever singer's staycation in Calif. In June 2021, Billie fans called out Matthew for allegedly using offensive language – expressing bigoted views about the Asian and other communities – in social media posts. He issued an apology at the time, writing, "I want to apologise for the things that I wrote on social media in the past. The language I used was hurtful and I understand how offensive those words are. I am ashamed and deeply sorry for that."