I'm '19F' in love with my childhood friend '20F'

we have been friends aka soulmates since 8th grade. But my friendship with her has always been weird and too intense. I have had other best friends and I have always been so carefree around them, but with her It was a different type of friendship, we never hung out much , but we used to text 24/7 , we were emotionally close , and I used to feel very nervous around her.

I never knew at that time that I was romantically attracted to her , because I didn't know it was possible for a woman to be romantically involved with another woman. Now few years ago I realised I am bisexual, and educated myself on lgbtq+. Today she came over to my house and I realised I still feel the same for her , I am really in love with her , but she showed me the picture of a boy she is in talking stage with.

I have never loved someone this deeply, and the thought of her with someone else makes me feel like I'm bleeding internally. She smells like roses and rain, when she left, my whole bedroom was smelling like her and I kept the door closed so that her smell would stay longer.

I told my other best friend about this , and she said that it is a sin, and that it is ok to feel that way and she always knew i've had a crush on that girl bcs it was very obvious , but she never said anything. According to her what I feel is not wrong but acting on it would be wrong and a sin. I love my bestie but I don't believe the bs she said. Loving someone can never be a sin.

What should I do ?I can never confess this to her , bcs it would make everything awkward and it might possibly destroy our friendship. I don't even know her sexuality, and I think she doesn't it either. She said that she avoids relationships because they feel suffocating to her , she doesn't like that someone is expecting day to day updates from her and that it feels wrong , but she agreed to talk to this guy because her cousin and friends pressured her , but she says he isnt that bad and we will see what happens.

She never had any problem with giving me day to day updates back then??? We dont text much anymore though, we only do once or twice a year hangouts and very emotional birthday wishes. I'm so confused G0ddd, I don't know what to do ?

TL;DR I'm in love with my female friend who may or may not be straight, and I don't know whether I should tell her how I feel about her or not.