@DW2 It just shocks me that a woman thinks that she should open with her saying she is polyamorous. I would expect a woman who wants to be able to sleep around but get a commitment to keep that desire under wraps until the man is (theoretically) too deeply committed. Yes, this would be vindictive and all, but I expect this rather than outright stupidity like this.
Men do not want to share a woman, and I don't think this woman can afford to tell men that they might be sharing her.