Mc Fadden later thanked her on Twitter for 'the best years' of his life.
She dated the rugby union fullback for a little over four months in 2016.
At some point in your life, you've likely had a crush on one of the Jonas Brothers, and you probably envied the girls who got to date them.
Even though the boys have been pretty notorious about keeping their love lives on the down low, that doesn't mean they haven't had their fair share of relationships.
Both Nick and Delta shared a black and white photo from their evening spent with mutual friends, where they just so happened to be sporting similar denim-on-denim ensembles.
"Good night with good people," the "Chains" crooner captioned the picture.
The source also revealed, "Now they're living together, they don't have to rely on stolen moments and secret rendezvous anymore".