How could I bring my boyfriend to the U.S.A on a fiance visa?

You cannot unless you are engaged. If you are and you have physically met in the past two years, then you will file the I-129F petition with the USCIS detailing your relationship. After it is approved, he will then apply for the K-1 visa at his home consulate. When he enters the US, you must marry within 90 days and then you file for his permanent residence.

You start the process by filing the form I-129F with USCIS. The instructions with the form can be confusing, so you should consult with an immigration attorney.

Bringing your fianc to the United States is a complex and sometimes frustrating process. The following is a generalized overview: The petitioner (you) files the appropriate paperwork and accompanying documents to USCIS. USCIS processes the package and upon approval the case is forwarded to the National Visa Center and then to the U.S. Embassy in your fiancs country. The Embassy processes the paperwork and sends your fianc notification of receipt and a checklist of documents required as well as certain forms to complete. The beneficiary next attends a medical examination. Finally, the beneficiary interviews at the Embassy. Upon approval the fianc enters the United States on a K-1 visa. The beneficiary applies for a social security number, marriage certificate (with you) and the parties marry within ninety (90) days of entry. This is just the beginning.

There is a fiance visa available. Among other things you must have met in person at least once within the past 2 years and intend to marry him.

You can apply for a fiance visa. This process takes about 6 months.