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Adjective for the discussion that goes on through the same points over and over again.

Example:

Okay, I think we should end this discussion, it starts to become ________.

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2

A discussion that goes on through the same points over and over is repetitive :

involving doing or saying the same thing several times, especially in a way that is boring:

(Cambridge Dictionary)

4

Okay, I think we should end this discussion, we’re just going round in circles.

Go round in circles is a commonly used colloquialism for a discussion or debate that keeps coming back to the same points.

If you say that someone is going round in circles or around in circles, you mean that they are not achieving anything because they keep coming back to the same point or problem.

  • The discussion itself can be described as circular – Chris H Feb 15 '18 at 19:29
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Okay, I think we should end this discussion, it starts to become fruitless.

  • useless; unproductive; without results or success: a fruitless search for the missing treasure. D.com

"unproductive" also works well.

Or "repetitious"/"repetitive" if that's the case.

repetitious - characterized or marked by repetition

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