Cal chose the crown over Mare once, which broke Mare's heart and she was very distant from him. She even plotted against his throne, but showed her love for him by saying that he lives when they overthrow him. In the end, Cal finally chooses her over the crown, even after she killed his brother.

Do Mare and Cal end up together War Storm?

After continuing the battle, they win Harbor Bay, and the palace at Ocean Hill (his mother's favorite place) is prepped for Cal to take over. The Lord of House Rhambos surrenders to Cal and calls him the “True King of Norta.” Mare and Cal reunite, though they both promise it changes nothing.

Are Cal and mare in love?

Cal is still "in love" with Mare (as she is with him) and technically single, even though their chances of remaining together have greatly diminished.