Drew Barrymore "feels like a failure" because her marriage didn't work. The 'Miss You Already' star announced her split from husband of four years Will Kopelman last week but things had reportedly "began crumbling" for the pair soon after they tied the knot. A source told Us Weekly magazine: "She feels like a failure. She's disappointed this didn't work. They both expected to be together forever. Things began crumbling shortly after they were married and the relationship unraveled over time." Meanwhile, whilst Drew is still upset from the split, she is doing all she can to make things easier on her daughters, Olive, three and 23-month-old Frankie, who she has with Will. She said previously: "I had a really hard time a couple of months ago and kind of knew life was heading in a new direction... "The only thing I care about, my life's mission and the only thing that matters as of now is that my daughters know what our lives were like, how we lived, and how much I love them. For them to know that they were not just loved, but ridiculously, utterly, life-alteringly loved. That's the only reason I'm here now!"