Ben Affleck jealous of Jennifer Garner’s boyfriend John Miller? Source

Ben Affleck is reportedly disappointed that Jennifer Garner chose John Miller over him.

As per the latest findings of RadarOnline.com, the 52-year-old actor believes Miller is "too boring" for his ex-wife.

"He's constantly asking, 'That guy? Really?'" a source revealed, noting that Affleck is unable to accept that the businessman is now part of the Alias actress.

"Ben still thinks he’s the main character in Jen's life despite her having moved on," the insider added.

They further dished, "Seeing her build a calm, normal life with someone who isn’t a celebrity — it drives him nuts."

"There's no drama, no red carpets and no headlines with John. Just… kids and books," the tipster tattled.

Despite the Deep Water actor’s alleged remarks, Garner and Miller and are said to be "fully committed" to each other.

"Friends say the root of Ben's unease lies in seeing Garner with someone who deviates so starkly from his Hollywood lifestyle," the confidant claimed, adding, "But she finds solace in John's grounded presence."

It is worth noting that Ben Affleck and Jennifer Garner were married from 2005 to 2015. However, their divorce was finalized in 2018.

 The former couple share three children together, Violet Anne, Seraphina Rose, and Samuel.