Idk what to feel about FL. She was manipulated, used, and power abused by a man she cheated with over an arranged engagement. Like, yeah that's a pretty dick move on both FL and Prince Reagan's part.
I get that she cheated because she felt the love she didn't know she could get from ML, but the fact remains that she only kept the engagement to suppress ML from gaining more political power if he could get engaged to another Lady who is much influential, so that Reagan can remain on the no. 1 spot in the throne.
FL was naive (and i'm blaming this on her—most likely—lack of education, being a young lady back then) but she could have at least kept her morale and leave ML alone, but she didn't and ended up cheating for a man that throws her away for a manipulative cousin.
And, FL continues to use ML to avoid her death in this life, with obvious knowledge that he likes her—she uses that to her advantage.
How is that not fucked up?
TL;DR : FL is a douche