Forgetting and then later remembering something is a common aspect of human memory. Memory is not a perfect process and it is influenced by many factors such as attention, stress, sleep, and more.
When someone forgets something you said or did and then suddenly remembers it later, it could simply mean that the particular piece of information was not immediately accessible in their memory at the earlier moment. The brain stores vast amounts of information, and not all of it can be readily recalled at any given time. Later, something may have triggered the memory, bringing the information to mind.
As for the lack of acknowledgment about the forgetting, this could be due to a few reasons:
- Lack of awareness: They might not realize they had forgotten in the first place.
- Embarrassment: They may feel awkward or embarrassed about forgetting, so they choose not to mention it.
- It's not seen as important: If the information isn't crucial or impactful, they might not feel the need to mention they'd forgotten it.
Remember, everyone's memory can be fallible at times, and it's generally a normal part of human cognition. If it's a recurring issue and it's causing problems, it could be worth addressing in a respectful and understanding way.