He can’t stop using “goddess” as a compliment

Is it haram to say goddess to someone you find beautiful? I can't stop saying that and it's becoming chronic. What should I do?

As discussed in this previous answer, it is unclear whether that is halal or haram, but it is clear that it is not a good thing to do. So do your best to avoid it, and maybe tell the person that you are worried that this is displeasing to God and tell them to ask you to stop using it whenever you use it. Maybe they can help you stop.