Who would betray their own flesh and blood?

SallyF
My friend forgave her younger sister for sleeping with her fiance. The guy was ditched but she decided to work things out with the sister. This was 4 years ago.

She admits that even though their relationship isn't exactly the same again, it has gotten stronger. I'm super puzzled. I wouldn't even do that to a friend. I don't get along too much with my own sister but in comparing to that, we're saints. I just can't picture stabbing her in the back like that.

Seriously, who does that to their own flesh and blood?
Who would betray their own flesh and blood?
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