Logan Paul tells TMZ Sports the Antonio Brown fight is officially dead ... and says his message to the NFL star after getting the news was simple -- 'I'm sorry you're a bitch."
Paul and AB had been hot and heavy in talks to get into a boxing ring later this year ... with DAZN officials even getting involved to try to promote the fight.
In fact, the two came face-to-face at a Super Bowl party in Miami last month ... and it seemed everything was pointing toward a mega-event.