Cheated on my wife with my son's babysitter?

Anonymous
(first of all, I'm actually 28 years old). my wife went to visit her parents and left me at home with my 3 year old son. I hired a babysitter (Mindy) since I was finishing up a project for work. after work, I made sure my son was safe, well fed, and asleep. the babysitter showed me that he was sound asleep. we then talked and watched Netflix together. I offered her some champagne and we drank together. then we had sex in the family room while my son slept.

what do I do? should I just hide this? a divorce may hurt my son. or is firing Mindy a good idea and leaving this behind?
Updates
+1 y
Mindy is 21 by the way
Cheated on my wife with my son's babysitter?
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