In January 2019, the 5 Seconds of Summer guitarist popped the question to his girlfriend of three years during a romantic proposal at the Ungasan Clifftop Resort in Bali. He shared a few of the gorgeous photos from their engagement on Instagram writing, "I was lucky enough to ask the love of my life to marry me in the place it all began for us. in the last 3 years she has helped evolve and shape who I am in ways I could never have imagined. I couldn't ask for anyone better to spend the rest of my life with. I love loving you, Crystal. ❤️"