I should probably clarify more about what I meant by “sense of calm”. I get the same feeling of calm with my family and close friends. Its just when I look at people romantically or new people in general, I usually get nervous because I worry if I’m not up to their standards. Being introverted, I get hung up a lot on what I should say and who I want to meet. With her, I didn’t feel like I had to do any of that and it felt the most natural. Am I mixing a deep platonic friendship for something more? I hope not, but the last opinion I really want on my relationship with her is my own because I am going to be bias about it.