Did Endeavor buy his wife?
Rei Todoroki Endeavor
bought her family over to marry her through a Quirk marriage. It's revealed that he chose her because of how her ice Quirk counters the drawbacks of his Hellflame Quirk.
Is Endeavour dead?
So yes,
the man who worked so hard to create "Endeavor" is dead and gone thanks to Dabi. However, the surprise arrival of Enji's wife Rei at the end of the chapter hints that Enji Todoroki may soon become a new sort of man and hero for the times. My Hero Academia is in production on season 5 of the anime.
Why is Endeavor abusive?
The monstrous man wanted
to beat All Might so bad he manipulated Rei into a Quirk marriage to breed a successor who could beat All Might. When his first kids weren't up to snuff, he cast them aside until Shoto was born. Endeavor groomed Shoto from a young age to fight, abusing him along the way.