the moral is 'dont tell the truth'
she made the mistake - she should have worked it out herself or with someone else.
by giving the information - she makes it someone's elses responsibility and pain to deal with it and that someone is her husband.
if he doesn't divorce then he is saying it is ok.
if he does he is unforgiving
poor guy can't win
if a man hits his wife... how many times should she forgive him?
both are a betrayal of trust, belief and faith.
i think it is selfish of her to tell him.

if my partner was cheating i wouldnt' want to be told - maybe i would have my own reasons for turning a blind eye.