Luke is from a long line of very proud wolves in the prestigious Flint clan. He was first in line to fight for and inherent the clan leader position, when his younger sister Mithyca beat him in the fight. Though many who witnessed the battle suspected foul play, nothing could be proven, so Luke was chased out of the clan with those who were most loyal to Mithyca snapping at his heels the whole way.
He was on his own for a good year before he started following the Harrison clan, smaller than his previous clan but still plenty well fed. He was only looking for scraps left behind when he saw June, and got a great deal more than he bargained for when she returned his gaze.
But that's all in the past now. Instead, now he leads the hunting pack in their own little pack, their family, and advises his mate on different matters. Looking back, he wouldn't have it any other way now. It turns out June has more leading sense than he ever did. And he's just fine with that.