The Mexican sensation was due to fight on Mayweather's undercard in May, on the proviso that he would get a shot at the American next year.
Alvarez insists that Mayweather went back on his word, but is unconcerned by the apparent snub.
"Mayweather has no word to support what he says," the 22-year-old told ESPN. "He said yes but nothing happened in the end. Floyd never signed anything.
"I have no need for Mayweather to impose these conditions because I can have my own fans, my own event and my own history.
I'm tired of being accessible to fight him, since he never was real in what he said. The truth is he doesn't want to fight me."
Alvarez, who is unbeaten in 42 bouts, will fight scheduled opponent Austin Trout in April instead.