There has been no real reason come out for the split, but a source has told ET that the pair were really, really in love.
"She became a homebody when they were dating. They stayed in a lot. She really loved him."
The pair first sparked dating rumours in June last year, after "they met through mutual friends and bonded over a lot of things - just having fun and their shared love of music. She has a thing for musicians," another source told Us Weekly.
We're sending all our love out to Lucy RN!!! <3