Name?

Fl (mc) is forced to be engaged with the ml who hates her because her family, I think killed his parents. So he neglects her and then later on she falls in love with someone else. Everyone, including the ml knows that because they are openly dating. So, the ml sends him to war and he never comes back. This leads the fl to hate the ml and says that she will kill whoever he loves so he can feel the pain she feels.
In the later chapters/raws that she runs away from him and lives far away with her former maid. The fmc dyes her hair and makes a living by making dresses but the ml goes crazy and tries to look for her.

Someone help us ༼;´༎ ༎༽