The British duo will meet at London’s O2 Arena on March 4 and the pair came face-to-face on Wednesday to promote the fight.
Haye appeared to aim a punch at Bellew as the situation grew extremely heated while they posed for pictures and 'The Hayemaker' also aimed a tirade of abuse at Hearn.
Hearn, who is co-promoting the event with Haye’s company, believes the 36-year-old has lost his composure because he does not have full control.
"He's a control freak, so he likes to deal with everything himself and the contract - some of the demands in there as Tony was talking about - were outrageous," he said.
"But we gave into them, because Tony doesn't care about who walks first, what dressing room he's in, who wears what gloves, how thick the underlay is.
"He just wants the fight. It really hurts David that he can't have full control.
"He wants to unsettle Tony Bellew. I thought David Haye was unsettled. I've never seen him like that, his legs were going and of course when you saw him in the head-to-head after, he had completely lost his marbles by then.
"He's out of control. He doesn't have the control he wants to have."