DEAR ANNIE: A few months ago, my life took a turn I never expected. After noticing changes in my wife’s behavior such as late nights at work, a phone that suddenly never left her side and an emotional distance that grew by the week, I followed my gut. Against every instinct that told me not to, I hired a private investigator. What he uncovered confirmed my worst suspicions: My wife has been having an affair with one of her co-workers.

That discovery left me with another haunting question. Had she been unfaithful for months or for years? And then the darker thought I could not shake: Was the little boy I have been raising for four years truly my own son? I wish I could tell you I pushed that thought aside, but I did not. I ordered a DNA test. When the results came back, they shattered what

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