My iMessages aren t sending?

I have an iPod Touch 5th generation and my boyfriend has an iPhone 4. We use iMessage to message each other. 's sent through messages, not texts, because IIm using an iPod and my boyfriend ran out of data so he uses Wi-Fi.) But I texted him the other morning and it said delivered but he never replied. So I sent him another one a few hours later and it took about 4 hours for it to say delivered. There was no reply so the next day I messaged him again and it delivered and he immediately got it, and he told me he didn't get any messages from me the day before. We were able to message for a few minutes until I last messaged him, and it delivered, and he didn't get it again. What's the deal?

Maybe your internet service was having an issue, hard to guess

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