Girlfriend doesn't return messages when she goes to her best friend's birthday.

If your girlfriend goes to her best friend's birthday party and doesn't reply to your message, it may just be because she is immersed in the celebration and may not notice your message. Of course, it may also be because she needs some personal space at this time and doesn't want to be disturbed.

Remember, people are sometimes so absorbed in social activities that they don't notice or reply to information. If your girlfriend doesn't reply to you after the party, you can try to give her some time to handle her own affairs. If she still doesn't reply, you can consider contacting her directly, asking about her situation and expressing your concern.

At the same time, we should respect her personal space and social activities. Everyone has his own life and circle of friends, and needs his own personal space. If she is enjoying a party with friends and doesn't want to be disturbed, you should respect her choice.

Finally, it is important to communicate honestly with your girlfriend. If you have any questions or concerns, please communicate with her directly to solve the problem.