Hey, as far as I am aware, the steady/unsteady relationship status has nothing to do with your political decisions or the ones focusing on your MC. It fully depends on the answers you choose in the one-on-one conversations.Here is a little guide based on my steady Dara playthrough starting after chapter 5 :
SPOILERS
When Dara asks if they trust Kham: Choose as you see fit This answer does not affect your relationship status.
Regarding Nima :Ask him why he hasn't visited Nima yet. Depending on your MC's traits, the flavor text maybe different.Regardless, the scoring answer remains the first one.
After Kham leaves you with Dara alone : Allow the bowing, and ask about the conversation.
For the next choice : It's not your fault.
Dara has a point there ..... : Wish him safe travels.
I hope that helps :)