I'm receiving all of his text messages but he isn't getting mine?

I can receive all of his texts. When I respond, it says they are sent but he never gets them. I have an iphone 4, I forgot what kind his is. How can I fix this? It's only him that isn't receiving my messages. My texts work fine with everyone else. He didn't block me and I didn't block him. What's going on?

Haha haha.

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