It could be due to the chemistry she had with her partner. The way they supported each other through tough times, like in their careers in the medical field which is full of stress. They might have had a special connection that made their story so great, sharing common goals and dreams while also having individual pursuits that complemented each other.
Well, perhaps it was her personality. Her determination and passion in both her personal and professional life could have been factors. Her ability to love deeply and be vulnerable in relationships might have contributed to it being a great love story.