My coworker said he would marry me if he was rich, but he's too poor. Do you think he's just saying that?

He’s possibly implying he thinks you’re a gold digger and is checking on your reaction. If you don’t bat an eyelid it probably means you don’t care about him being rich or not. However you shouldn’t marry a coworker. I had three potential coworker boyfriends, all of which never really went anywhere and one went very wrong.