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After one year of marriage, Britney Spears and Sam Asghari are going their separate ways.  Sources say, Britney and Sam had a serious fight before their split but she's adamant she didn't cheat. The two haven't got along for a while and it finally came to an end after a major blow up." According to TMZ, who was first to report the news, the decision to split comes after Asghari confronted Spears over rumors that she had been unfaithful, leading to a big blowout fight. Per TMZ report, Asghari had already moved out of…