By the time we catch up with Tully and Kate at the start of Season 2, their relationship is already strained. Following a car accident that left Tully’s daughter, Marah (Yael Yurman) injured, the two of them eventually grew apart.

In the meantime, we also catch wind of her relationship with her former KPOC colleague, Danny Diaz (Ignacio Serrichio). They first meet in 1985 and initially hit off. Despite some love triangle drama, they end up sleeping with each other on several occasions.

Source: https://www.distractify.com/p/who-does-tully-marry-in-firefly-lane