Divorcing my billionaire husband, his best friend wants me

Blurb: The only crime Joanna committed was protecting him from the fact that he could have lost his inheritance if they didn't marry. She has been in love with him since they were kids, they were best friends, but he certainly didn't feel the same way. She thought maybe one day he would spare just a second to look at her but that never happened. Just like that, she was stuck up in a loveless marriage with the one she thought was her best friend not until he brought his pregnant sister to live with them.. She was supposed to be his sister but why does he keep looking her way? He preferred her needs more than his wife's needs.. He would kill to protect his sister but not his wife? Joanna would feel like a third wheel each time she was in their presence.. It didn't take so long for her to find out that she was truly a third wheel. He married her so he could be able to hide his relationship with his sister! How could he?! She never meant anything to him.. Now it all made sense. Joanna divorced him and walked away but what's one best way to get revenge? If not, seducing his best friend, the most powerful man in the city at the time, LUTHER MARTINS.