double-cross

to deceive or betray someone

Synonyms: beguile, betray, bluff, cheat, con, cross, deceive, defraud, double deal, dupe, four-flush, hoodwink, humbug, illude, juggle, mislead, scam, sell, sell down the river, sell out, sell out, split, stab in the back, swindle, take in, trick, two-time, two-time

Antonyms: be open, tell truth

He is a man who even double-crossed his own brother.