Consider NATO. The USA spends 3.6% of the world's largest GDP on military. You agreed to spend only 2% of your smaller GDP, but only 3 countries (UK, Poland, Estonia) bother to do so. Overall the EU is a slacker, with some countries spending less than 1% of their GDP. NATO is really about defending Europe, but the military budget of all of Europe is less than half of the US military budget.
Meanwhile, you are imposing your own huge tariffs on US products and flat out banning us from selling you stuff like Swiss cheese. You're even trying to get us to agree to ban making Swiss cheese in our own country, forcing us to import it from Switzerland. I'm guessing you don't see how absurd that is; you have a financial motivation to believe that your rules make sense. You've even screwed up the web, with your silly cookie warnings, and now again with some GDPR thing.
You've had a great deal, and you don't want it to end. I get that. It's understandable. The deal was made in the ruins of WWII, to our disadvantage, when Europe was in ruins. You're better now. It's time to have a fair deal for this modern world.