5. I Can't Believe Your Boyfriend Left You

This compliment will hit your frenemy where it hurts.

If she recently got dumped, you can use this line in order to sound like you're complimenting her on how amazing she is, when really you're just finding a way to remind her that she's alone.

Of course, you can switch up the compliment by saying something like, "You're so smart.

I can't believe you failed out of college." Use whatever ammo you have.

You Look Gorgeous, like a Different Person
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