But the relationship was cut short when Jackson died June 25 in Los Angeles following a suspected cardiac arrest.
'I've lost my soulmate. It's very hard to describe the loss I feel, but there is something that's empty in my heart,' said Pfeiffer.
He also claimed that he was in regular contact with Jackson through to his final days and that the star began acting strangely two weeks before his sudden death.
'He completely changed in the final two weeks. He was overly religious, overly dramatic, exhausting and exhausted. He was saying goodbyes the week before passing. Everyone was creeped out by it,' he said.