What do you mean, girlfriend doesn't reply to text messages?

If your girlfriend doesn't return your text messages, I'll help you analyze the following possible situations:

She is busy with her own affairs now, so it is not convenient to reply;

The mobile phone is not with me, so I can't reply for the time being;

You did something that made her angry and didn't want to reply to you;

The phone is in arrears or down, even if you want to reply to the message, it is impossible;

His parents stared at him closely and wouldn't let him reply.