After breaking up with Knightley in 2011, Friend didn't date anyone publicly until he met American athlete, actress, and model Aimee Mullins in 2013. According to Vogue UK, she was diagnosed with fibular hemimelia when she was a year old, which resulted in the amputation of both of her legs. Mullins competed in the 1996 Paralympics and has acted in both film and TV over the years, most notably as Terry Ives in Netflix's "Stranger Things."
Friend and Mullins met in 2013 and announced their engagement in 2014. Two years later, the two tied the knot in a private wedding on May 1, 2016. Mullins shared a thoughtful post on Instagram to commemorate the couple's one-month anniversary, writing, "Celebrating one beautiful month of being married to my best Friend! The 1st of May was a gorgeous rainy day… an elopement in the field got moved into the compost shed. Our kind of magical day."
While Friend and Mullins maintain a relatively private personal life, the two do share thir love for one another on social media from time to time. In 2018, Friend shared a picture of Mullins on Instagram with the caption, "The incomparable @aimeemullins did her own hairdo for the #strangeangel premiere last night! #multitalented #stunning."