My girlfriend said that if I go to work in a different place for a long time and can't see her, I'm afraid she can't stand loneliness and derailment. What should I do?

Judging from your girlfriend's meaning, she wants to work in a different place, and she is not a lonely person, so she will tell you that she will cheat. If you like her very much, then go to the city where she works with her and find another job, so the problem will be solved. Otherwise, if you force her to stay with you, your salary will not support her. It is better to work in another place, and there may be unexpected gains.