Send it to your ex to read the blessing message and don't reply.

First of all, you are sure that you are not boyfriend and girlfriend, and keep in touch with each other. He replied to your text messages every time before, and he had to explain to you when he came back late, which showed that he didn't put you down in his heart. Still care about you. And you habitually send him a text message, which shows that you also have him in your heart. Why do you have to break up? If you really regard him as your ordinary friend now, I think you should send a message of blessing, and he doesn't need to reply to you after receiving it. As an ordinary friend, as long as he is happy, he won't care if you can't reply to the message. What's more, when you are alive, you won't be the only one who receives phone calls and text messages. First of all, you have to understand whether you still have feelings for him.