Is it true that once you go black you can't go back ?

Ok so me and my bf are having the dumbest conversations that once a white person male or female get some black love there are stuck! I told him that I know some white women who dated black men and went to a white man. vice versa , like Russell Wilson who was once with a white women now with a black women! Please let me know ladies , is Mandingo really laying it down better then John ? 😂😂 or Keisha laying it down better than Becky ? or Becky lays it down better then Keisha ! Lmao