How does a immigrant become a citizen after they marry a US citizen?

my boyfriend from mexcio and we want to get marry but he not us citizen i from usa

Individuals who obtain a Green Card through marriage to a U.S. Citizen are granted "Conditional" Green Card status, which is only valid for two years. Individuals who have been granted Conditional Green Card Status are required to apply to remove the Conditions on their Green Card within 90 days of the date that their Conditional Permanent Resident status expires.After conditions are removed the applicant is issued a green card valid for 10 years.If married to U.S. Citizen you may apply for US citizenship after 3 years with valid green card.