Possible Clues:

• Cheats on
• Deceives more than once
• Betrays romantically ... or what each starred clue's answer contains?
• Betrays
• More than once
• Betrays, as a spouse
• The Irish and the spring, for instance
• Brace of 16 down
• Cheats on white-haired father in braces
• Engages in double-cross, ie XX?