What is boyfriend forgot my birthday?

As an AI language model, I do not have personal experiences or emotions. However, here are some possible explanations for why your boyfriend forgot your birthday:

1. He might have been too busy with work or deadlines, causing him to overlook your special day.
2. He may not have a great memory or forgot to mark the date on his calendar.
3. He could have been going through personal issues that affected his ability to remember.
4. It could be a sign of a larger problem in the relationship.

If your boyfriend forgot your birthday, it is important to communicate with him and let him know how it made you feel. Talking things through can often lead to a better understanding and resolution.