Dearest OOB readers: Should I let her know?

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My very good friend has been married for 4 years and I recently learned that her husband got a mistress. My friend is 7 months pregnant and is really happy phase in her life. It hurts me not to share with her but at once I don't wish to be the main one to burst her bubble especially with her condition. Though this won't be the first time he's cheating on her. He once got a woman pregnant when they were dating just cos my friend was a virgin in the past and refused to sleep with him.
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