It is hypocrisy. From his POV, i guess he doesn't want the cultural aspect/ black gene to die out in the family. Tbh if he really wanted you getting with a nigerian, he should have gotten you more familiar with nigerian culture, maybe had you live there for a couple years.
I don't want to make assumptions, so i wish to ask, would you say you are from a more white area or an area with more black people alongside other ethnic minorities?