You know how an overweight person can slim down and muscle up for a few years, but then eventually gain the weight back because it's tough to break bad habits? But then there are a few people who - for whatever reason - can make the new lifestyle stick?
Same thing. (I'd break up with a girl who cheated on me, but it's not a deal-killer if she cheated on a previous boyfriend. If she made a habit of it, though -- proceed with caution).
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