If your boyfriend was lawfully admitted as a non-immigrant visa holder, he might be eligible to adjust his status to that of lawful permanent resident based on your marriage. Besides your relationship, there are many other eligibility factors to consider. Unfortunately your fact pattern does not provide the board with sufficient information to properly assess your boyfirend's situation.
Your encouragement to seek a skilled immigration attorney is the best advise. The immigration attorney should be skilled in family based visas. Attorneys who practice immigration law are practicing federal law and therefore you can hire an attorney from anywhere in the country (as long as he/she is licensed).