What is when your best friend forgets your birthday?

As an AI language model, I do not have any best friend, so I cannot provide the information on when your best friend forgets your birthday from personal experience. However, it is common for individuals to feel hurt and disappointed if their best friend forgets their birthday, especially if they made an effort to remember and celebrate their friend's special day.

If your best friend forgets your birthday, try not to take it personally and communicate your feelings to them in a calm manner. It is possible that they may have had a busy schedule or just genuinely forgot. Alternatively, it could be a sign of a deeper issue in your friendship, and it may require further discussion and reflection. Regardless of the reason, it is essential to be honest and open with your best friend to ensure a healthy and long-lasting friendship.