Girl seems interested but I’m 90% sure she’s talking to another guy?

So this is a girl that I have work with who seems very interested in me when we’re together (thinks everything I say is funny, teases me constantly, playfully hits me, all kinds of shit, she’s even drunk texted numerous times) however the whole time I’ve known her I’ve noticed that at least twice now she’s spent the night at a frat house (yikes) and the other day she posted some peach colored flowers on her story.

she's never talked about another guy or posted one or anything but I’m 90% sure she’s talking to someone else as well while acting extremely flirty with me. Now to be fair I’ve played it fairly cool and she’s probably not sure I even like her (don’t wanna come on too strongly seeing as we work together) and I have no doubt I’m better than whomever it could be but I’m not sure what to do.

Girl seems interested but I’m 90% sure she’s talking to another guy?
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