Girlfriend sends a breakup message, but boyfriend doesn't reply.

He was bored, and the idea of putting it off for one day was one day. He refused to break up with you and ignored you, which was the most terrible feeling. You thought you broke up, but the other party didn't really agree. Maybe in a few days, he will suddenly send you a message saying that he misses you. But it is better to clarify this relationship. In your situation, it's only a matter of time before you break up. Call him and ask him what he means.