The presenter, 56, said he and Susanna had a “blazing row” off air but viewers “barely noticed” because of their “fixed cheesy grins”.
What’s the latest Piers Morgan news?
Piers wrote in his Daily Mail column: “Susanna Reid and I once presented a whole three-hour episode of Good Morning Britain together without exchanging a single civil word on or off camera after a blazing row.
“But the viewers barely noticed thanks to our fixed cheesy grins and cheery chats with guests.”
He added: “Appearances can be deceptive.”
Piers left Good Morning Britain back in March.
It came after a backlash over his comments about Harry and Meghan Markle’s Oprah Winfrey interview.
The star had said he didn’t believe a word Meghan had said, after she opened up about feeling suicidal and claimed she didn’t recieve help from the palace.
After his departure, Susanna delivered a message on air saying he was “without doubt an outspoken, challenging, opinionated, disruptive broadcaster”.
She added: “It is certainly going to be very different but shows go on and so on we go.”
Piers later discussed the statement and joked that his ex Marion Shalloe spoke about him “more fondly” than Susanna did.
He wrote in his Daily Mail column: “I got an instant flurry of new texts from bemused friends asking if we’d fallen out.”
Insisting they hadn’t fallen out, Piers also said Susanna rang him to say sorry.
Piers added: “She apologised for the tone of her chilly goodbye, which was for all the reasons I suspected…
“…and I apologised for leaving her in the lurch so suddenly.”
Do you miss Piers on GMB? Leave us a comment on our Facebook page @EntertainmentDailyFix and let us know.