Love rat (İngilizce) — someone, usually a man, who cheats on his partner; a man who betrays, or is unfaithful to his wife or girlfriend.
"Love rat" in lyrics
His glance found me in crowds of people all around.
He saw my bitter tears and lowered eyes in shame,
The love rat realized that my life went up in flames.
Along the Murom tract road three pine trees stood chagrined,Russian Folk - Along the Murom Tract Road