Sounds like you will need a US immigration lawyer to help you obtain a visa/ green card.
For more info on the process see link below and contact us or another lawyer if you have questions
Generally, a person who entered the country illegally and is here without proper immigration status must return to his/her home country to file an immigrant visa petition to be able to return to the United States. The problem is, once he/she leaves the country, he/she faces an automatic unlawful presence bar of inadmissibility of 3 or 10 years before they can return (3 years if he/she had been in the U.S. less than 6 months and left voluntarily, 10 years if in the U.S. more than a year)....
Not automatically, but there will be a presumption that your green card was obtained fraudulently . You will need to document your marriage was entered into in good faith
It is very possible to keep your green card, but I would hire a lawyer now to plan the process
1. Since you areworking legally, you can use your income to overcome the affidavit of supprot requirement
2. Sincey ou are living apart, it wil lraise red flags in the eyes of immigraiton as you have the burden to show you are in a bona fie marriage. Thus, you will need to show proof you call, email, text, visit your spouse among the other "requirements" such as co-mingling of assest, pictures, joint taxes etc...
An attorney can heklp you overcome this burden
You can not lie about your spouse's immigration status. That could jeopardize your application for citizenship. You could try to assert privilege, but in general USCIs rarely does anything if you list you spouse is out of status. Could they notify ICE.. yes.. but that is rare