Николай вдруг почувствовал желание и необходимость рассказать все свои задушевные мысли (такие, которые не рассказал бы и матери, сестре, другу) этой почти чужой женщине.
Nicholas suddenly felt a desire and need to tell his most intimate thoughts (which he would not have told to his mother, his sister, or his friend) to this woman who was almost a stranger.