In my theories, and many other peoples', Sarabi and Taka/Scar were in love. In my theory, Sarabi loved both Mufasa and Taka equally, but was devastated when she found out she was expecting Mufasa's child. She thought Taka/Scar would hate her, thus she began to feel a bit miffed, as this picture shows.
Render (c) Tytos