'It's harmed his and Brad's relationship, though Brad denied having said that specifically,' the insider said.
Jolie also allegedly told Pax that Pitt “was angry” she had gone ahead with the adoption.
The tension over another adoption “almost ended the relationship, but Brad stayed,” the source added.
The actress filed for divorce from Pitt in September 2016 after an alleged altercation involving Maddox and Pitt on a flight from France to L.A.