Why do woman like black dick better?

My ex had almost hooked up with a 10 inch bbc right before we got together but she didn’t. I’m white, but she told me she always had a thing for black guys. Few years later we break up, and 3 days after we break up I want to get back with her, but she had hooked up with a black football player at her college. I continued to have sex with my ex while she was sleeping with the football player, ik I was sharing her. I didn’t know his size, but I’m pretty big for a white guy, I just wonder why some girls like black better.