In a new memoir, Jennifer Lopez opens up about her 2011 split from Marc Anthony, and also reveals she's felt abused in past relationships.The newest issue of People magazine features an excerpt from her upcoming book, True Love -- out Nov. 4 --, which details the moment in 2011 when the singer says she realized she needed to divorce Anthony.Lopez recalls feeling increasingly pressured to appear to have a perfect relationship, ultimately suffering a panic attack during a photo shoot in Los Angeles.