<human>: Provide a brief overview of the text.

Should my [27m] girlfriend [25f] of 8 months confess to her ex [27m] about a past infidelity?

Now before I get into the question [first reddit post], I love my girlfriend. We have worked hard at our relationship. After the magic and rainbows of a new thing we have created a sturdy foundation. We are the socially awkward, emotionally introverted and the life of the party, emotional loudmouth tandem, with me being the latter. If we had a super power it would be looking pretty fucking cute together. Just to reference, I have never cheated on a girlfriend but have been tempted so I can relate to the appeal. 

Background on the question:
My girlfriend cheated on her then boyfriend with a coworker after dating for 6 months. We have talked about the incident and while I'm not incredibly fond of the infidelity, I can move forward in our relationship with trust in my heart. 

Issue:
She continued dating her ex for approximately a year after cheating on him and eventually left him for a relationship with me. I take more of an issue with the year of silence than the act itself. Cheating on your SO... I'm not happy but I can understand. Letting him live a lie for a year... Scares me. She's got the keys to the driver's side door of my heart... and she's been drinking. [I know that doesn't make sense but I said that to myself out loud like a gruff action hero and couldn't stop laughing, ha] This is someone I could build a life with, have a family and hold until we are old and leathery. In 8 months she has been nothing but wonderful and has my absolute trust, but I still wonder should she confess? Would it have a purpose? I guess what I really want to know is will she have the balls to tell me it's over if necessary or will she let me live a lie. Give me your life experience reddit. Ever cheat on a SO and tell them about it years later? Did it help you? Did it help your current SO? Any purpose at all?
<bot>: Should my [27m] girlfriend [25f] of 8 months confess to her ex [27m] about a past infidelity?