I wish to say something along the lines of
"after she found out her husband was cheating on her"
however I have realized that 'cheating' is colloquial. Is there a formal alternative that is a verb?
Merriam-Webster's 3rd Unabridged
: to make a cuckold of (a husband)
Philander Main Entry:2philander Function:intransitive verb Inflected Form:philandered ; philandered ; philandering -d()ri\ ; philanders
: to make love frivolously or in a trifling or fickle way : DALLY, FLIRT belles and beaux philandered in the big hotels— Van Wyck Brooks *his penchant for philandering with pretty stenographers finally drove his wife to sue for divorce*
adultery : voluntary sexual intercourse between a married man and someone other than his wife or between a married woman and someone other than her husband; also : an act of adultery
"after she found out her husband was an adulterer"
"after she found out her husband had committed adultery"