Distraught and in tears, Tim Paine stepped down as Australia's Test cricket captain on Friday after revelations he had been investigated and cleared over sexually explicit text messages sent to a female former colleague four years ago. The development has plunged Australia's Ashes preparations into disarray three weeks before the first Test in Brisbane starts on Dec 8. Breaking down in tears while reading from a statement in Hobart, Paine said he was cleared by a Cricket Australia Integrity Unit