To end a relationship so badly that you can never go back.
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To wreck a relationship for good, or shut a door you may need later.
When you burn your bridges, going back becomes impossible and the other side won't deal with you again.
It's often a warning to think twice before you say something you can't take back.
"Cross the Rubicon"
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Make a final, permanent decision with no going back
"Cut Ties"
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End a relationship deliberately and calmly
"Burn Your Bridges"
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Permanently ruin a relationship through careless or hostile actions