Tell the truth about biological father or stay silent?

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Today’s Topic:

Hey Lip and Shelby, I need some advice. My son’s about to turn 18, and he has no idea that my husband isn’t his biological father. His real dad walked out on me when I was pregnant, and my husband’s been there since day one — raised him like his own. Most of the family knows, but my son doesn’t. Now that he’s grown, I feel guilty keeping this secret, but my husband says it doesn’t matter — he’s his dad, period. I just don’t want this to come back and ruin our relationship later.

So should I tell him the truth, or let it stay buried?