Windows to fix things close quietly. You don’t hear them shut.

Chances to repair something do not expire with a warning. There is a stretch where an apology or a call would land easily, then the distance becomes normal, and eventually the same message would be strange rather than welcome. Nothing announces that change, which is why it gets missed.

If there is somebody you have been meaning to put something right with, this is still the simple part. Send a short message without a full explanation attached to it. Awkward now is a great deal easier than impossible later.