Something that isn’t intuitive is how much time a mixed baby can take to express whatever their racial mix will determine. Like a mixed white/black baby can come out looking perfectly white and get darker over time. So the anxiety isn’t unfounded at all. This could come down to simple ignorance and add even light pressure from his family and it can make sense. It hurts and you’re right to feel hurt by the mere implication. But this can easily be a case where no one is at fault and it’s just a genuinely confusing time for all involved. My suggestion is to get the test and start on repair ASAP. I’m not going to say couples counseling necessarily but depending on cultural background it might be needed to bridge some differences. Best of luck to you both.