M 21 F 21

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M21 F 21

I have a crash on this girl since I was 6 grade,I was shy in the moment and didn’t know I should do back then and the last thing I knew about her back then was that she was in relationship with a guy that I know ( that was around 9 grade) ,tbh I still have a crush on here till now ,we still have each other friends on instagram , I’m not that active but while ago I posted a story in a operation room (I study medicine) and she liked it, does this like mean anything? and the other thing that she still follow and like the recent posts of that guy that she was in a relationship with , does it mean that she still with him?What do you guys suggest doing if I want to be with her? Is knowing about her situation a good idea if she is in a relationship or not before doing anything?
TL;DR: I have a crush on a girl for a long time and I want to properly approach to her