
Any spoilers

Spoiler
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They get divorced :P
Apparently he loved her since the beginning but didn't know how to show it so he just gave her everything she wanted but didn't comfort her when she was having a hard time. The reason why she wanted to die was already shown in the last chapters, pent up stress led to postpartum depression so she neglected her son. Once she came back to the social scene she was still very young but people called her "bad mother" so she thought that 'young lady' was gone and the only thing she would be known for was being a mother which made her feel lonely because she was still young. After this i don't know all the details but
She mends the relationship between her son, but the duke kept a lot of secrets and they divorced cos of too many problems. The duke joins a (secret) rebellion and tries to kill the prince (the son of fl's sister i think),,not really sure cos this part was a little weird.
The fl's brother dies and in his will he appoints the fl as the next head of the house instead of his son, she finds this strange so she decodes his will and finds out that theres a rebellion taking place.
The fl's mother was a princess from another country so she goes there and blah blah she stops the rebellion but her ex husband gets labeled as a traitor so he's about to get executed but the fl shows up and saves him i think. He's labeled as dead but he's alive.
She tells him that she can't forgive him but she still loves him, theres a lot of development here but in the end they go to the country where she's a princess (cos her mother was a princess there before marrying her father) and they stay there. Vincent goes there too and after a while they find out fl is pregnant and she promises to herself that she'll be a good mother to both of her kids this time.
Any spoilers for me