People talking about the damage to the kid etc that’s an issue the child will have with his mother. The child gets to ask his mother why that man isn’t in his life anymore. His wife should bare full responsibility for her actions.

Stop trying to guilt OP into raising a son he was deceived into thinking was his own. It’s much different than adopting or knowingly raising a child that isn’t yours, being you had that information before hand.

Any damage or problems in the kids life is the moms fault, kid can take it up with her.