It seems to me that you lead him on first and then changed your mind later after comming to US. That was unfair from your part but everything works out at the end. Marriage in cousins, though allowed in Islam, I think it can be easily avoided without any 'GUNAH' to avoid any problems in children. I have seen many examples of abnormal children from these kind of marriages.
Try to communicate with him.
no i didn't lead him on, even he said that.