Why do people say Black man are leaving black woman for other girls?

They always joke how black woman look like this and that. My boyfriend is black and he is not the one chasing other girls. My bf actually gets approached by white, oriental girls and Meztiza latina girls. But most people think is the black man who approaced this woman. And instigate how black woman and black man have tensions in their relatinships. No one makes a big deal when you have Latinos going for white woman and Black woman. Or when White man go for black, latina and asian woman. Its always the Black man leaving the black woman for other woman. And the poor black woman crying over black woman. If a black woman wines about a black man then their stupid. And man and woman can date who ever they want. But many people say Because black woman are fat, ugly, getto and have huge attitudes. Then thats why black man are leaving them. They say black woman are nappy hoes. Look people theirs bimbos from every race. People don't talk how some asian, white, and latina bimbos because a woman doesn't do that walk up to Black man because they have a weird fetishes or jungle fever. But they do make a big fuss when this black woman had a 3some with 2 guys and had her picture in the internet. But they ignore when you have all this white, latina, asian bimbos giving head to a black gangzta guy on the internet. I don't hate no one. I have black, white, indian, asian, latino friends who are guys and girls and are respectul human beings. But since im black i hate how many people talk bad about us on the internet because their to chicken to say it to our face. Look at all the questions and you always have someone talking about black people.