What a tangled web we weave!

Oh what a tangled web we weave, when first we practice to deceive” is a quotation by Sir Walter Scott

We also talk about a 'web of lies"

It means that when you tell lies or act in a dishonest way you create problems and complications which you cannot control.
When someone tries to deceive another person, by lying and making up stories, he or she will make a mess of the deception.

If you tell a lie, then you will have to make up more lies to support the first lie, and then even more lies to support the other lies, and in the end you have a mess.