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Rob's surprise arrival brought mixed feelings to the mansion. Both Rob and Erin had to keep their past a secret; otherwise, the guys would know that Erin had been through this experience before. Meanwhile, Eric seemed a little put off by the fact that the rest of them had endured eliminations and ""put in their time"" while Rob just got to waltz in at the end. Little did he know that Rob had more than paid his dues. Chad wondered if maybe Rob was a one-night stand or an ex-boyfriend, but said he didn't really want to know. Later, he said he couldn't stand him! On the other hand, Wade took it as a sign that things had taken a turn for the worse. When Eric tried to find out how Rob knew Erin, Rob dodged it by saying he didn't want to talk about it. Eric called it a ""lawyer mentality"" that Rob was discussing things on a ""need to know"" basis. Wade was especially peeved that an ""ex-boyfriend"" had been thrown into the mix. Boys, boys, simmer down! Rob felt his advantage was that he knows about