Girlfriend doesn't reply to her boyfriend's text message.

I think there are many possibilities for this situation. You can look back and think about whether there was any small friction between you before. If not, did he get impatient or absent-minded when you got along with him recently! The former shows that he is still angry, while the latter shows that his heart is no longer with you. I advise you to give up. If none of the above is true, his mobile phone may be dead or broken. Shut down for maintenance, even if the phone is connected, it may be a call transfer! If you want to stop thinking, ask! This is not a long way to go. . . . .