I have accidently sent a message to my ex. Please help?

adidj
i have accidently sent a message to my ex on whatsapp. He had changed his number and he didn't knew that I have his new number and now I have sent him message. And now I am very much frightened that if he will recieve the message then how he will react. please tell me how to remove the message from whatsapp so that it should not be seen by him.
I have accidently sent a message to my ex. Please help?
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