Have you just experienced an FML moment?
Feel like sharing it with the other FML users?
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I don't know what's worse - the fact she slept with your boyfriend, or the fact that she actually gave up going to your aunt's funeral to do it. I'm sorry for your losses, both aunt and the loss of a decent sister.
I hope you told the rest of the family what you caught her doing. She sounds pathetic if she skipped the funeral of a relative just to backstab you, and hopefully the rest of the family agrees.