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изменщик sacentos
gen. cheater (Юрий Гомон); betrayer
Gruzovik, antic. apostate (= изменник); betrayer (= изменник); traitor (= изменник)
jerg. clintonist (natusik_tzeluyu_v_zhopusik)
period. love-rat (Cambridge dictionary: a man who has had a secret sexual relationship with someone who is not his wife or girlfriend. This word is usually used in popular newspapers. Olga Fomicheva)