Simple past tense and past participle of two-time.(verb)
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Use "two-timed" in a sentence
"Young campaign aides roll across South Carolina in the back of oversize SUVs, reading the memoirs of their two-timed first lady, Jenny Sanford, while her soon-to-be-ex-hubby occupies the governor's office and pines for his "soul mate" in Buenos Aires."
"She was thirty-three, alone, and the crowning act in her epic history of failed relationships was being two-timed by her own student."
"Given the fact that what had looked like rape had in reality been rapture, and that he was being two-timed by his lover with the connivance of his mother, it seemed unexpected for Chip to keep the woman away."