That one-sidedness has always been at the heart of President Trump’s relationship with his longtime lawyer and fixer, Michael D. Cohen, who has said he would “take a bullet” for Mr. Trump. For years Mr. Trump treated Mr. Cohen poorly, with gratuitous insults, dismissive statements and, at least twice, threats of being fired, according to interviews with a half-dozen people familiar with their relationship.

“Donald goes out of his way to treat him like garbage,” said Roger J. Stone Jr., Mr. Trump’s informal and longest-serving political adviser, who, along with Mr. Cohen, was one of five people originally surrounding the president when he was considering a presidential campaign before 2016…

“The softer side of the president genuinely has an affection for Michael,” Mr. Nunberg said. “However, the president has also taken Michael for granted.” Mr. Nunberg added that “whenever anyone complains to me about Trump screwing them over, my reflective response is that person has nothing to complain about compared to Michael.”