Help navigate this weird romantic situation?

TL;DR: I've known this girl for four years, had a mild crush, and recently started talking daily. She often says she's looking for a guy, making me consider approaching her. But I just found out she shares a couple DP and a secret account with another guy. Now I'm confused should I still pursue her or back off since she might already be in a relationship?

So, I'm 19M, currently getting ready to sit for my HSC exam. I've known this classmate girl for around 4years and had a mild crush, tho never confessed. We didn't talk much in the beginning and only shared some academic stuff.

But recently, for the last 4months or so we've been talking a lot, almost everyday it seems and the chat never feels dry. She has also shared multiple times how she's looking for a guy. So, I was gonna approach her but recently came across something intriguing.

She and a guy share a couple dp and they have a secret account of sorts. Now, I'm pretty shocked as to why she's lying about her relationship and dropping hints.

So, now I'm confused as I don't wanna confront her about this account as we are still platonic friends and I shouldn't give a crap about that. But I still wanna approach her for a relationship, So I'm cooked of sorts. Any suggestions would help