Gemini
Gemini ends the affair when he or she gets bored or when a partner makes to many emotional demands or does not appear to care enough for his/her happiness. While the affair may appear to end suddenly, Gemini has no doubt been secretly unhappy for a long time. Once a decision to end the affair has been made it will be irrevocable and Gemini will merely freeze the lover out and vanish.

Yup, sounds about right.