<human>: Everything began when she approached me for opinion (we aren't even close at that time) about her ex who broke up with her because her ex father died and wanted to fix his life. 

We regularly hangs out after that. I have nothing worthwhile to do anyway and not dating anyone at that time. At first, I was not interested and getting tired of her drama but she's so persistent. Eventually, after a few months, I developed feelings for her.

She told me she wasn't ready, so I just accepted it and not force her but kept doing my thing. 

We were like a couple by then, holding hands in public, kissing and sex. We talk everyday for hours and discuss anything under the sun. She drops by my office to visit me (she's my former co-worker) and asks me out sometimes and so do I. This has been going for around last two months.

And then suddenly, after a date and hanging out which we really enjoyed, she doesn't reply anymore. I thought she was just busy but I saw her commenting on Facebook with her friends. Then suddenly shows up at my office and mentioned she's thinking about my previous proposal, where she said before she wasn't ready. 

However, I found out by hearing from her friends she stills talks to her ex that she despise. She didn't block him. I asked about it and she mentioned her ex doesn't try to win her at all and staunchly denied going back to him. 

She still refuse to talk to me to this date and all she mentioned is that she's hurt by her ex again and there's no answer why (which is vague). She also told me I didn't do anything wrong. I recommended to block her ex but I had to repeatedly tell her for her to say she'll do it, which I think she still didn't.

I keep calling and texting her, but to no go. She doesn't respond. What do I do? I got used with her around my life.

Can you summarize the given text in a few sentences?
<bot>: dating a girl, all was ok and suddenly doesn't want to talk to me because she's hurt by her ex and there's no reason why. what do I do?