"Complete betrayal" refers to a situation where someone completely breaks trust, goes against loyalty or does something harmful or disloyal to another person. Full definition
The bill's introduction largely ended what had been, until then, a bipartisan process, with Rep. George Miller (D - Calif) calling it a «complete betrayal of education equality» and «a knife in the back to the bipartisan process.» (huffingtonpost.com)
The complete betrayal and heartbreak that momentarily flash across Fr. (firstthings.com)
Today, Isaacs has expanded on those comments a bit in an email to to Manhattan Republicans, in which he calls the alleged actions of those arrested «an outrage and a complete betrayal of the public trust,» adding: «With three Democrats and three Republicans arrested, it also shows that corruption is not limited to an exclusive partisan provenance.» (nystateofpolitics.com)