Most Helpful Guy
We think black girls don't like us because most black girls don't like us. I've only seen maybe 3 or 4 black girl/white guy couples in my life. Furthermore, I've almost never heard a black girl express any type of attraction to white guys. I usually hear black girls talking about wanting a "strong black man." People go where they feel wanted, which is why white guys shy away from black girls.
Most Helpful Girl
It seems we forget about one important fact...
It's the same idea as when you won't ask out someone you find attractive, because you think they will say no without any obvious signs. They just don't know and no guy likes to risk rejection.