In June 2021, Millie and Jake first sparked dating rumors after Jake shared a photo with Millie on Instagram and called her his "BFF." Later that month, they were photographed walking hand in hand in New York City.

In November 2021, Millie finally made their relationship Instagram official with a blurry pic of them at the London Eye. Given that information, we can assume they've been dating for over a year, but not quite two years prior to getting engaged.