Just let her go.
You've not met her in real life and only spent some time exchanging texts/calls right? You don't know her and you don't know if she is 'special' or "stands out". This all sounds petty. Best to let it be for now. If she comes back around or unblocks you then you'll have on opportunity to rectify your behavior, if you want to... If you are wiling to get your ego bruised why not own up to your slip up? Humility can be attractive, but don't become a wussy.
It does suck when you meet someone you feel something with only to have things go sour, but oftentimes those feelings are simply manifestations of your own desire and you project things onto this person you hardly know. In this case you really don't know her at all, so why you're hung up on it I can't say. When I found myself in the past getting caught up on a girl I would sit down and anayzle my thoughts. -
-Why do I like her?
-Am i coming from a place of scarcity
-What qualities do she have?
-Is she attractive?
-Do I know her well enough to make an informed judgment?
etc...
Within a few minutes of pure objectivity it would become apparent that I actually didn't know this person well and had formed some idealized framework around them or was infatuated with lust. Only on one occasion did I ever sit through this process and come out liking the person more and justifying my feelings for them. In that instance I messed up not to dissimilar to you. When the opportunity presented itself I owned up to my mistakes and we both apologized for being immature and petty. Well, it still didn't end well and shortly thereafter my ego got bruised, but there was a lesson to be learned and opportunity for growth.