"burn your bridge(s)"

ewenwen2007

Meaning: no turning back, must go forward, making an irrevocable decision
Example: \"Don't burn your bridges when you leave a job. You may need good
references later.\"

Origin: If you cross a wooden bridge, then burn it, you won't be able to
cross back to the other side. Thus, you are stuck on the other side.

A similar expression is \"cross your Rubicon\". Rubicon is a river in Italy.
When Julius Caeser crossed the Rubicon with his army, he officially
attacked the then Roman government, thus starting a Roman civil war.