Hi ! I'm looking for a shojo I've reed a long time ago. It's about this girl who marries t...

Hi ! I'm looking for a shojo I've reed a long time ago. It's about this girl who marries the son of a rich family/ heir of a company, and start living with his parents and brother. But the husband is a real good for nothing, a cheater and is never home, I think he didn't even turned out for the wedding and his brother had to remplace him.
She start getting close to the brother and finally decide to divorce and marry him instead.
f you could help me find it, that would be great !