they all have terrible taste in men, easy as that. None of them seem to really have much sense of self-worth, they all pick guys who treat them like absolute trash, unsurprising that it never works out. Kanye was a great move for Kim, career-wise, but otherwise he also had little respect for her. And the others, serial cheaters. some with massive substance abuse problems, none of those men are longterm relationship material in the first place.