Why does my girlfriend ignore me? She won't return my messages. What should I do now?

Maybe she is not sure where she is in your heart, so she wants to test you.

If you cherish her, apologize first, and then tell her calmly that you care about her and hope that she can cherish the fate between you. Ask her to discuss something with you, and stop using the cold war method.

Generally speaking, girls are not unreasonable, just need more care and love, and prefer to be spoiled. If they were more pampered, they would be very docile.