Well since she was young when they got married the ml keep his distance to her thinking that it may help her comfortable. While the fl always stays in her room because she was afraid to him since he was much older than him (I don't know the age gap yet) she also thinks that the ml doesn't want her because he also didn't talk to her. That's why in this current timeline the situations change because she starts to approach him first and she starts to open with everyone. So in their past life is full of misunderstanding.