Mistress of the Marquis by Margaret McPhee

Mistress to the Marquis - Margaret McPhee

The story starts with a break up. A rich lord decides that it's time to marry and tells his mistress that their affair is over. And of course after that the fool realizes that he is in love with his mistress and living without her is quite miserable.
The mistress, who can't believe what a jerk the lord was, leaves his house, starts acting again and tries to go on with her life. But it's not so easy when you bump into your ex every time you turn around.

I liked the story. It didn't bother me that I didn't know anything about the beginning of their affair.
  It was a solid 4 stars read.