回複：他辦親屬團聚綠卡，在他取得綠卡之前結婚，我可以加入他的申請

depending on which category of family based immigraiton. if he is 2B (unmarried son or daughter of lawful permanent resident), will lose priority and ineligible to get greencard for your boyfriend.if first preference, get married will cause dealy of his green card. there are also issues from Child Status Protection Act. need more specific info.