When Fallon must choose between her love for Gavin and her own pack, she realizes that death is staring her in the face.
As the pack leader, Fallon kept things simple because the only thing that mattered was protecting her family. Since Gavin left the pack, she has forced to accept the fact that love for a partner only leads to grief.
Being an alpha made Gavin's life difficult, and he didn't want to make matters worse by claiming a mate for himself. He believed that just one woman had his heart, and his pack had long since moved on.
When a civil war breaks out amongst the packs, Fallon runs into Gavin and must choose between her love for him and her pack's affection.