The person who only respects your boundary after consequences never respected the boundary.

A boundary that is only honoured once there are consequences was never being respected; it was being tested and found unenforced. This distinction matters because the eventual compliance can look like understanding. What changed was the cost, not their view of your limit. That means the compliance lasts exactly as long as the consequence does.

Watch whether someone respects your limits because they matter to you or because ignoring them became expensive. The first holds without maintenance. The second requires you to remain vigilant indefinitely, which is worth knowing before you relax.