Creep by Jennifer Hillier

 

Dr. Sheila Tao is a professor of psychology at Puget Sound State University. Her expertise is in human behavior. She's engaged to Morris and wants nothing more than to be married to him but her affair with her teaching assistant Ethan Wolfe can derail it and destroy her life personally and professionally.

Sheila ended the affair. Ethan is angry and his ego has taken a hit. He has becomes obsessed with Sheila and it's unhealthy. It's also scary.

Creep is entertaining and fast paced with a few surprises thrown in.