I am a US citizen (only). I married a man from a visa waiver eligible country and applied for a green card for him, which he received as a conditional green card. A few months after he came to live with me in the US, I lost my job and we immediately arranged to move to his home country. This took place long before his conditional status was due to be reviewed. We have been here in his home country for four years. Did his conditional residency expire automatically, or does he need to still file a form to abandon it?
We have no plans to return to the US to live, but we may return temporarily for a short vacation or to attend a wedding or funeral in my family. Is he likely to run into trouble at the border even though he is not a visa required national?