In Chicago Fire’s explosive Season 10 finale, Stellaride officially tied the knot. Casey and Brett, on the other hand… did not. When long-distance became too difficult for the couple to handle mid-season, Brett took time off from work to visit Casey in Portland. After staying with him for a month, Brett then returned to her life in the Windy City, and the couple reunited on Stellaride’s wedding day.

As Severide and Stella’s respective best man and maid of honor, Casey and Brett helped the ceremony go off without a hitch. Unfortunately, things took a turn for the worst at the reception.

While the couple danced together, Casey told Brett, “I wish you could have stayed forever,” to which Brett replied, "You made a beautiful life for yourself in Oregon, Matt. But it's your life, not mine. My 51 family is here. My work is here, my life is here. How much longer can we keep this up with so much time apart?"

Casey’s response was a dagger to the heart. “I don’t know,” he told Brett. “But we’re together tonight.”