Trump was never "engaged to be married to a black woman". He merely dated Kara Young - who is in fact biracial and looks more white than black - for two years. Had she not been a top model at that time, there's a strong possibly he wouldn't have even done that.
You seem to be blissfully unaware of his reputation and repugnant history dating back into the late 70s. Perhaps this will give you some insight...
https://www.vox.com/2016/7/25/12270880/donald-trump-racist-racism-history
That article doesn't even touch on all the contractors, lawyers, architects, etc. he financially stiffed through the decades; nor all the scam business entities and charities he created which were ultimately forced to shut down due to fraud - Trump University for one - nor inventing the pseudonym "John Barron" in the 80s to call into media outlets nationwide singing Trump's praises (pretending to be Trump's spokesperson), all the while it was him making those calls himself.
Nor the fact he's cheated on all three of his wives and paid off women to keep quiet about it; nor that polling experts on this own team told him months prior to the election he was going to lose; nor that at least 11 members of his senior cabinet repeatedly told him post election there was no evidence of mass election fraud which would have changed the outcome of the election; nor the fact that to this very day - after his own AG, Director of CISA, Republican SOS and Governors nationwide plus 64/65 court losses (many of which were ruled on by Republican Judges; some he appointed himself) yet continues to this day to promote his Big Lie (which, I might add fueled the Jan 6th insurrection because people believe his BS).
Now tell me again how Biden is so much worse.