>>13470185OP listen up. You're going to do this right. Maximum shame and guilt for her. Pack up everything now. First thing in the morning ask to speak to a close family member of hers that you have a decent relationship with. Preferably a sibling or parent of hers. Tell them what's happened and explain that you simply cannot be there knowing this for the next week but that you don't want to cause a scene and ruin her mom's wedding. Explain that you'll be taking her car back home today and request that they help her get back home. Make sure you keep all anger out of your persona and just appear devastated. Remember you're supremely disappointed not mad. Head out to the car with it packed up and leave without telling the GF anything
Congratulations you are now the complete gracious victim of adultery who is still considerate enough to not ruin the wedding and thoughtful enough to think of her return trip while extricating yourself from a bad situation.
Unless her family is a bunch of uncultured trash this will result in her having to at least admit it to the one family member. Either they will tell her or she'll ask where you are. Now over the next 7 days your absence will be noticed and the reason for you leaving will eventually leak especially if your confidant is a sibling. She gets to spend the next 7 days surrounded by family who knows you left because she's a cheating slut. Even if it doesn't leak she'll be asked about you constantly forcing her to lie in shame.
You'll be home the same day packing up all her shit and ghosting her from this point on to maximize the head fuckery. 15 years from now she'll write an article that gets published with the title "I cheated on the man I loved thinking I could do better and now I'm alone and childless at 41."
Do it right anon. You got this.