I think she was only planning to divorce him for absolute freedom not only for her but also for him since, he obviously showed no interest for her at the beginning. But soon enough both of them will realize it eventually since they're the main characters. Tho, it'll be a long journey since fl went through a lot during her past lives. With regards to why she chose him, it was all to avoid marrying the crown prince and he fits the characteristics or qualifications she was looking in order for her plans to finally succeed. And I thank you- Chariiiiiz haha