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Noun: two-timer  'too,tI-mu(r)
  1. Someone who deceives a lover or spouse by carrying on a sexual relationship with somebody else
  2. A person who says one thing and does another
    "a drifting two-timer";
    - double-crosser, double-dealer, betrayer, traitor

Derived forms: two-timers

Type of: beguiler, cheat, cheater, deceiver, slicker [informal], trickster