I lied and told my cheating partner after 5 months of not knowing the full extent of her infidelity that I cheated on her with a professional.
What do you mean when you say cheated with a professional?
Yes, she has been to a school for this purpose.
You should tell them the truth. I would be so hurt to find out from someone else. You better tell her first.
Why should I and I never said I did it to hurt her.
You need to tell her because it is important that you tell your partners the truth. I think that honesty is the best policy.