The phrase "endless spiral" means getting stuck in a never-ending cycle of something, which keeps repeating and is difficult to escape from.
Sentences with «endless spiral»
When used recklessly, they open the door to a seemingly endless spiral of debt. (fidelity.com)
As a result, they get stuck in an endless spiral of perfectionism that prevents them from creating the content their audience needs them to produce. (inc.com)
The French cardinal, who was appointed to the post in June, almost a year after Pope Benedict XVI's controversial speech in Regensburg, argued that dialogue between Christians and Muslims is «the tool which can help us to escape from the endless spiral of conflict and multiple tensions which mark our societies.» (faith.org.uk)