(Precursor i'm a 22 yr old permavirgin, very youthful looking which doesnt help but I get decent interest from girls, I'm just crippled by Anxiety)

I've been talking to this girl at work for a while now, shes very much my type and has shown a fair bit of interest, but she has a habit of being super flirty and then suddenly going cold. She broke up with her boyfriend a couple of days ago and immediately messaged me telling me so, I responding flirtaciously asking her out but she's a bit dumb and missed it, should have been straitforward I realise. We worked together a couple days ago, had a lunch date together etc and talked all night afterwards on the phone, very sexually, but shes gone completley silent again, she responded to my messages today immediately after I sent them, but her responses were just single sentences.

The thing is this has happened once before with her, last time she broke up with someone something similar happened, she actively avoided me for a couple of weeks after that one.

Advice would be appreciated, have I been flirt-friendzoned or do I still have a chance?

this oneitis is the worst I've ever had and I was literally sick today over the thought that I fucked my chance up, I live in a very small Midwest town so having abundance is near impossible