He lives in a total different county than me
Different county? Or different country? No, you cannot file single if you are legally married. Your filing choices are to file married filing jointly or married filing separately---or maybe Head of Household if you have lived apart for at least the last six months of 2024 and you have the children living with you.
Please provide an explanation-----is your spouse just a few miles away in a different part of your state----another county--or is he in a different part of the world--in a different country?