What is the deeper meaning of God warning Abimelech about a married woman?

The obvious meaning of God telling Abimelech that the wife he chose was a married woman, was that God wanted to protect the relationship purity of Sarah and Abraham by not allowing third party handlers to interfere with their connection, but I came up with a secondary offshoot meaning based on this verse:

And that is, God is telling you, sometimes you have to consider not just what you want, but also whether the thing you want is available for you to take, and whether the thing you want will bring dangerous and unintended results if you allow yourself to take it, and that applies to a lot of things in your life.

As a child, I worshiped material things before I ever learned to believe in God, and I thought I was just enjoying my life.

I did not know at the time, that unstopped money indulgence and food indulgence can destroy your moral fibre and turn you into an evil and malicious person who hates God and hates the reason they were put on this earth by God, which is to love and be kind to others.

What is the deeper meaning of God warning Abimelech about a married woman?
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