After season 5's finale where Sam, possessed by Lucifer, went to hell and was inexplicably back on Earth, Dean attempted a normal life, as he promised Sam he would. At the start of season 6, audiences saw what Dean's life was like without hunting or Sam — for a year.
Dean prior to this had a borderline martyr complex where he would've done anything to save Sam, like selling his soul to resurrect him. Without the option to bring back Sam, and his disinterest in solo hunting, Dean became much more empathetic, had better communication skills, and fulfilled typical suburban expectations, like having a normal job, attending barbecues, and taking care of his new family.
However, when any sign of his old life crept up, his original angry tendencies slowly returned, like when he lashed out at Ben for holding a gun. Many actions, admittedly, revolved around one of Dean's biggest fears in S
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