I like this girl at my work

Hi guys I really like this girl at work and. Feel like she is the one but she is just utterly beautiful. Unfortunately she has a boyfriend.
However i over heard say she is not In a relationship with him for some odd reason but then someone said are you guys in a relationship and he said yes.
So I either she is not trustworthy in a relationship or there a running rumour going around as in gossip they are just friends but I asked her out before but it was too late for me.
So that chances off me getting with her is at a very low chance even she likes give me chocolates and cute stuff gives me.
I just take she just wants be friends so I guess that’s what we were but I just want to be more than friends with her but it Will never happen.
Also she is leaving soon which is going to be hard for me as most likely won’t really aeee much of her. So what should I do I can’t mess up a relationship and possibly get into to a fight with him.
Which i don’t want that to happen so i dunno what to do I guess just leave it and stay friends as there absolutely no way will get into a relationship so I am turning gay.

Well, I guess you can express your sadness for her leaving soon cause you guys are still friends. And tbh you could just ask her straight up if she has a boyfriend or not to spare her the confusion.