it's time you should find out things clean and clear ,i also don't know how but try to go that way , >like many of us don't tell our problems ,he could be in that situation where he is still in the process of green card...going through waiting process also .... and not telling you his pain side of story  ,or either just like you are guessing he is ignoring you and enjoying the cozy life himself ,but whatever may be the case ,you should be strong and talk about this things clearly so that you will get answer and move on with your life .Good luck and hope you will know the facts soon.