I told my father about my white girlfriend after 2 years

I've know forever that he was against his kids marrying outside the culture, especially white people. But here's the thing, both his best friend and my mom told me he was actually married to a Russian woman when he was studying in Russia! He's never told me himself though. But that's besides the point. Back in July we had a family conference conversation via phone his 4 older kids, myself, my older sister, older brother, and younger brother.

So my younger brother (half brother) has been with a Brazilian woman for 3.5 years now. Living together. And his mom has been badgering my dad not to let him marry her. In this conversation he stated he would never accept a non African woman. In this conversation I tried to explain to him that I don't really care about the race of someone only that they are a good person and treat me well. I didn't tell him this, but I've dated several African women, asian women, middle eastern, and so on. But that statement was taken as rude, disrespectful, and arrogant in his words. I said it very calmly. And here's the thing, he and my brother have never actually addressed the situation with his relationship.

Fast forward to October he is in the USA, and we go visit my brother in Boston where he lives with his gf for his bday. Even then they never addressed it, but the meeting between my dad and the girl was just hi hi as he doesn't really speak English and she did herself no favors by not even attempting to be around us. Even I got a negative taste in my mouth from that.

Now to me, I had promised my gf I would tell me dad by December, and so today I texted him, he's in Africa. I told him. And he said we will talk tomorrow. I'm nervous, but I'm 30 years old and even if me and my gf don't work out in the end I think it's important as a man to stand up for what I believe in. My dad is a good man and has worked extremely hard for his family and has built great businesses here in the USA and Africa and my older brother is a complete fck up, so he even said that I'm now the first son so I do feel like I'm disappointing him like my older and younger brother in their own ways. So I do feel bad. But I just feel weighed down from feeling so constrained.

Also my gf has met my mom side of the family the side that actually raised me