Why Women Put Up With Nonesense????

i have a friend that has been married for 28 years her husband has always cheated on her ....she has busted him twice and forgave him twice all the other times she hasnt found out....she is a beautifull woman in her 50s and she goes to school and she also works she has various degrees she doesnt need him ..i can understand if she didnt have a trade and couldnt do it on her own but this is not the case she is also a strong black female i see more and more that black women put up with a lot more than any other women why is this and how may i hel her????