Just did the exact same thing my dude, happened last saturday, been togheter for 3.5 years, same as you.
But do you know what? We're still young (atleast I am, I hope you are aswell), we can finally do exactly what we both want, we only need to think about ourselves from now.
Go buy those stupid fucking gaming merchs you always wanted
Go to the gym however long you want and get ripped
Stay up how late you want, fall asleep however early you want
Cook YOUR favorite meals
Get over it, theres a ton of opportunities ahead