Cheating on Relationships

I want to ask on your thoughts regarding cheating/infidelity on current relationships. This question is for those currently on relationships that have had an affair, those who were previously in relationships who have experienced it whether you were the cheater or the cheatee, or for anyone else who have cheated on their relationships.
My question is:
 
How did it make you feel the first time you did it?
Who did you cheat on with?
Was it a one-time or reoccurring event?
Did your partner find out? Did you tell them?
Are you currently in that relationship?
Did it end?
Have you ever been the other woman?
I want to hear your stories.