She stole her best friend’s boyfriend (from her)

She stole her best friend’s boyfriend (from her)

What is the reason for adding the redundant phrase from her after mentioning that it's her best friend?

The most obvious possibilities are that (a) her best friend is a "her", in which case the parenthetical is redundant and one could delete it, and (b) her best friend is not a "her", but a "him" (or something else not a "her"), in which case the parenthetical is not redundant but essential. If we assume the author knows how to write, he or she has added the parenthetical to make it crystal clear to the reader that her best friend is a "her", and not a "him" or something else.

Figuring out the meaning and syntax of the English translation of Charmides

What is the mean of « is believed to » [closed]

In "You can lead a horse to water, but you can't make him drink", why is the horse a male?

If you lost your signifcant other or a partner, but you weren't married, are you still a widow/widower or what is the correct term?

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Meaning of “the parties are directed to discuss in respect of any order or direction applied for, the purpose of the hearing...”