Kim Kardashian is speaking candidly about what led to her decision to finally separate from her now-ex-husband, Kanye West. Kardashian filed for divorce from West last February.They were married for nearly seven years and share four kids together. Since then, West has been publicly stating that he wants her back as well as making public declarations about their co-parenting relationship, accusing her of many negative things. Speaking in a cover story for Vogue, Kim explained that turning 40 helped her get some perspective on her life. She made the decision to focus on herself and her happiness, which she notes ultimately led to her divorce. "For so long, I did what made other people happy," the reality star explained.