
They’re not showing it, but they clearly said a lot of time has passed. There was a month that passed then they talked about her getting used to the capital, etc so they’ve known each other for at least a couple of months, which is enough. Some people fall for each other quicker than that. And in that kind of time period, they’re at the perfect time to consider marriage. The only reason why it seems fast is because we didn’t actually see those months go by.

Don’t forget Suspension Bridge effect!
Boy was literally a war hostage and she offered him kindness(something he hasn’t seemed to have gotten from many people)
ALSO
She has been hurt so often that when bro raised his voice- she readied herself to get hit. AND THAT was after months of being together(wounds don’t turn into scars for another month or somthn and they don’t ‘fade’ for another week or three months) So homegirl has also been a recipient of bad relationships :2
So because her life’s sOoo fucked up
She understands that she may be confusing his gratitude for affection.
Idk they act like they’re in love with each other when they barley know one another and she didn’t even recognize him at first either it’s like it’s progressing too fast in my opinion not my cup of tea tbh (¬_¬) (tho we need more justice of a knight and fl getting together)