Finding out you're being/have been cheated on

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Scenario: Megan, Layla, and India are really good friends. Megan is currently in a relationship and is head over heels for her man. Let's call him Fred. Unfortunately, Fred is cheating on Meg. Both Layla and India are aware of Fred's wrongdoings, but Meg has no clue what's going on behind her back.

Layla wants to be upfront with Meg and tell her that Fred has been stepping out.

India would rather stay out of their relationship and let Meg, be happy. She believes what's done in the dark will come to light at the right time.

Now, are you the "Layla" or the "India" in your friend group? Is there a right or wrong way to handle this situation?

Bonus question: Let's say Meg and Fred are married, does that change your opinion?

Why?