My girlfriend broke up with me

So recently I found out my girlfriend cheated on me. She told me about how she cheated recently and instead of getting angry, I just fell on the floor and started cackling. She kept telling me that she "was not joking" and she told me to be serious, but I really couldn't take her seriously. I laughed straight for 15 minutes, my stomach hurt, and I was really out of breath. After I finished, she looked me in the eye and said "babe I'm being serious, I cheated on you, and I'm so sorry". Instead, this enticed me to laugh even more. The tears on my cheek should have been from sadness, but were actually from laughter. Then, once I calmed down I looked at her with a straight face and said "sorry, I was just tickled pink by your remarks, but I know you were being serious". She kept saying she was sorry afterward, but then I grinned from ear to ear, and told her to check her bank account (we share a bank account). When she opened it, I chuckled and said, "notice anything….. different?". She screamed in horror upon realizing I spent all of it on Genshin Impact and various other gacha games. Then following that I responded with "I knew, you cheated, all along, all along, all along" (I didn't, but at that point i could really say anything, and she would have believed it). She told me we would be breaking up, and she told me not to call her, and in response I went into another fit of laughter. Just before she left the house in her car with her stuff, I yelped out, "babe! Wait! There is something I need to tell you!". She said "what" in an annoying tone (stupid bitch) and another –what some would say, mischievous– grin appeared on my face, and I followed it up with "check the hood, I spent some money making some really neat modifications to the car, for our anniversary gift". She squealed in happiness, and said, "what is it?" excitedly. To her dismay, and shock, when she opened the hood, all she saw was 2 cubic meters of Vinyl Coated, Grade A, 7/16", pink fiberglass that I bulk ordered from Home Depot. I spend the next 30 minutes on the driveway, keeled over laughing as she called her new boyfriend to pick her up. You really should have seen her face.