Because they date actors and men with money, men who have a ton of options. So they are somewhat disposable in that world.
The reason why Jada Pinkett Smith is 20 years in with Will is she is one of the most realistic black actresses in Hollywood, she gives Will a hall pass and no drama if he fucks other people (not siding on rumors so keeping it general), all of the Sanah, Elisse and etc, want monogamy and feel they are beautiful and should get it. They should date regular guys but they think they can only be with a certain type of man, famous or rich. Time is not on their side.
They are like expensive jewelry sitting in the case of a jewelry store, they are over priced with no market and each year passes and newer prettier pieces come on the market.
