Why did Kayla call Bennett "Townsend"?

She, his own wife, could only call him Mr. Dreskin, and at most Bennett.

Maybe she really was a fake Mrs. Dreskin who didn't deserve to call her own husband by a pet name.

ALL of a sudden, Claudia was no Longer in a good mood. She didn't feel like learning to ride anymore.

While she stewed quietly and let her jealous thoughts consume her, Bennett took a deep breath behind her and then began explaining, "My grandfather gave me the name ‘Townsend’, and it's now my middle name. My mother used to Like calling me by that name when I was little.”