Why am I the bad guy?

I dated this girl over the holidays last year, and we stopped seeing each other because she wasn't over her ex.
I was there and supportive of her and I let her vent to me. But she started treating me like crap and after she snapped on me, I gave up. I removed and blocked her on social media and never texted her and she never texted me.

I recently ran into her and she said I hurt her and I was a piece of shit for saying I'd be there for her and leaving.
Why am I the bad guy? We dated for less than a month and she treated me like shitM
Why am I the bad guy?
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