I'm in love with my best friend.... and i don't know what to do..

So... I've been talking to this girl for almost 3years and while I'm in college rn she has a job (she's a year older than me). So we both were in a relationship with different people and broke up about an year ago at the same time and since then we've been talking like everyday.. yk trying to help each other out after the break ups. And i never wanted it.. but i prolly fell in love with her after so many months of daily texts and late night talks. So i mustered up the courage and told her about it. She never gave a proper answer cuz she thinks it's not serious, she said that it must've been cuz we talk daily... and so she said she'll give her answer if I'm ever serious about it, which i actually am but she doesn't believe me. So there's a boy at her workplace who likes her and has asked her out several times and she's always said no cuz she says he's like her ex and he'll eventually cheat cuz she's sern him with other girls before. But one day she decided to give him a chance and said yes when he asked her out again. But then he stood her up when it was the date and never came and it genuinely hurt her and she told me she will never date that boy. And i think what hurts me most is that she gave that boy a chance and not me. But she still talks to me every day and shares her daily routine and even calls me whenever she feels down. But, recently we haven't been talking daily cuz she's been transferred to a far away place from her home.. and that co worker has also been transferred to a different office but near to her. Ik she's busy.. but even so i always think what if she's talking with that boy(which she prolly does cuz they're coworkers and they might need help with each other's work) and deliberately ignoring me..

I don't know what to feel about this...I like her but it's genuinely hurting me.

I don't know what to do cuz it's been bothering me a lot as i can't focus on my current life cuz of this as she always keeps popping up in my mind throughout the day

(Sorry.. English is not my first language)