@sullyfish6,
Yes, that's what I was going to say too. "It's complicated" is a set option on Facebook and basically means not single but not really in a relationship either. That sounds like it describes what's going on with you (you'd be taken aback if she listed herself as in a relationship with you already, right?)
Might be that she's referring to the other guy or someone else entirely, who knows. Definitely ask her or else let it slide -- we don't know one way or another, anyway. (I'd actually recommend letting it slide at this point, just hang out with her and see what develops.)