Let me approach an answer via a question.
Can anyone point to a “first rate” (for lack of a better term) white woman who has publicly dated or married a black man? This may sound incredibly racist, but I sincerely don’t intend it to be. I just can’t think of a white woman who is attractive, self-confident and individually successful who has a black mate. The ones that come to mind are older, unattractive to some degree, have evident personal issues or bring nothing much to the relationship.
Even if a counter-example or two can be found, especially in these (wonderfully) enlightened days, does anyone contend that I am wrong in a more general sense?
So maybe subsequent lack of interest from white men is for other, pre-existing reasons.