How should I act around a girl I like who just got a boyfriend?

Hello!

There is a girl i have known for 3 years and last 8 month i fell for her and we had lots of moments togather, lots of teasing going on and doing a lot of staff togather

I just saw her story with some guy, she got a boyfriend and i don't know what to do.

She is in same environment i am and i can't just get away from her, i have to see her like 5 times a week, and even just days before we were walking the same path, hugging, talking

I don't know how do i act arround her when i see her, i was liking almost every story of her and didn't like that one with guy, i don't know if she knows my feelings or not, i don't want to make dramatic changes so it's obvious either

I don't know if i can erase thoese 3 years, i can't just cut off, but at the same time as much as i want to look at her as friend the thought of her beeing with someone else makes it impossible

How should I act around a girl I like who just got a boyfriend?
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