Probably not.
1. Paul Graham and Jessica Livingston tend to keep their private life private.
2. If I'm correct, it seems unlikely Paul told anyone he hired Sam to protect his personal interests as a married man nervous about his pretty younger wife working closely with another men.
3. If I'm correct, he probably didn't even tell Jessica because that would have come off as "I don't trust you" and not "I am worried about his behavior."