Sounds like you were a back up plan from the get go, and its really nothing wrong with that. The lying and fronting you should watch out for. But if she holding you down now

Just Tread carefully.
Either she really was dealing with some heavy family stuff or she's mad emotional.
Also when a girl see's you with another girl we instantly become more desirable to them, I hang with my sister alot and people always think we are a couple

I swear I get flirted with twice as much when I'm out with her as opposed to going out alone or with the homies.