She doesn't speak to you, and she said she is single on Facebook? She broke up with you, you just don't know it yet.

Seems to me like she is already single in her mind, looking for someone else (maybe she's already seeing someone), but hasn't officially broken up with you yet because she knows you are so obsessed with her ("this girl is my whole world") that she can just return to you as a fallback option if she can't manage to get someone 'better'.

My advice: she did you a huge favour. Do you really want to spend the rest of your life with someone who got so angry at you just because your credit score wasn't high enough, that she raged at you then left and cut contact? Just move on. Now that you no longer talk to her, you have tons of new free time, and you are also no longer spending any money on her, so you have more money as well. Go to the gym, develop a new skill, get a new hobby, try to get a happy and fulfilling life without her.

If she does want to eventually get back with you, she will initiate contact soon. If she doesn't, she doesn't. There's almost 4 billion women on the planet, you will be able to find someone else whenever you want.