She, on the other hand, tends to echo him. Her love grows when he loves her and turns to hate when he hates her. All is not lost, however. One-quarter of the time, they manage to bring their love into synchrony for a brief interval of true passion. Students love it.
Love certainly makes the world go round in surprising ways.
Jones, F.J. 1995. Rinaldi, S. 1998. Strogatz, S.H. 1994. With Applications to Physics, Biology, Chemistry, and Engineering . Love affairs and differential equations.