What if my girlfriend knows I sent her a message but doesn't return it?

If your girlfriend knows that you sent her a message but didn't reply, you can consider the following possible reasons:

1. She may be busy with other things and can't reply to your message right away. In this case, you can contact her later or give her some time to reply to your message.

2. She may feel uncomfortable or don't want to reply to your message. In this case, you can reflect on whether your words and deeds may make her feel uncomfortable and try to communicate with her in a more positive, understanding and respectful way.

She may feel uncertain or uninterested in your relationship. In this case, you need to seriously think about your relationship, try to communicate honestly with her and find a better solution.

Whatever the reason, you can take the following steps to deal with this situation:

1. Stay calm and rational. Don't over-interpret her behavior, and don't be too nervous or angry because she doesn't reply to the message.

2. Give her some time and space. If she needs time to deal with her emotions or things, you should respect her decision and give her enough space to think calmly and respond to your news.

3. Re-examine your relationship. You can reflect on whether there is any problem in the way you communicate with each other and whether there is anything that needs to be improved.

4. communicate honestly. If there are problems or doubts between you, the best solution is to communicate frankly. When communicating with her, you should be open and honest, express your feelings and needs, and at the same time respect her thoughts and feelings.

Finally, remember to be patient and understanding when dealing with this situation, and avoid excessive speculation or excessive behavior.