How do I navigate this situation?

I have known this girl for the biggest part of my life and we had a crush on each other back in the day but nothing ever happened.

We became what I thought was friends but our behavior around each other never changed and I thought people were just over exaggerating when they said that they thought we were together or doing something. At a party we were once posted on some story saying we should get a room (we never kissed or anything), people have asked more than once if we were in a relationship and are sure we hooked up.

But recently i heard she was i to me again at a point and then I started thinking, our behavior never changed but because i thought we were friends but what if she has always remained seeing it differently. I thought the door was shut but because I heard this i started to really like the idea and now I am into her again. But because we always acted the same I am not sure what to do.

How do I navigate this situation?
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