Strange about face

I had a weird one today. I was told i was the only one being considered for a position. The interview seemed to go very well. The HR manager said he'd be putting together an offer package and sending it over by weeks end. Instead what I get today is an email saying we've decided to open it up to other applicants. You're qualified, but I dont have any positive feedback for reasons they chose this. The problem comes in where my ex significant other is the president of the company I was just terminated from. I was fired for a very bogus reason..the real reason is our personal relationship ended with animosity on her part. NY is an at will state, so there's nothing i can say. Or is there?

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