Imessage not working, not delivering and turning green with certain number?

So recently i went to bed and when i woke up I could no longer text this specific person. I thought they blocked me so i deleted the convo. I got an email from them asking i blocked them? I tried texting the messages turned green when she has an iphone and it wouldn't deliver. Hers wouldnt either. I've signed in and out of imessage but nothing worked so far. What's wrong with my phone?

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