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Adjective: two-timing  'too,tI-ming
  1. Not faithful to a spouse or lover
    "a two-timing boyfriend";
    - adulterous, cheating
Verb: two-time  'too,tIm
Usage: informal
  1. Carry on a romantic relationship with two people at the same time
    "He was caught two-timing his girlfriend"

See also: unfaithful

Type of: betray, cheat, cheat on, cuckold, wander

Encyclopedia: Two-timing