Why won't my iMessage work for just one person?

I just got my iPhone 5s yesterday and set everything up like I was supposed to with an apple tech on the line with me. (I previously had the iPhone 5 && my carrier is AT&T ) Now today my phone won't sent any iMessages to my boyfriend. He is the only one I'm having issues with. He as well has the 5s && we're both on Wi-Fi but yet nothing on my end. His shows the messages as iMessages && my phone shows his as iMessages. It's just mine from my phone to his go as a text.
What I have tried it logging out of my Apple ID && logging in. I have turned on && off iMessage as to FaceTime. I have restarted my phone multiple times; both with the regular lock button && the lock n home button. I have tried messed with the air plane mode. I have tried messing with the restrictions.
Basically I have tried everything that I know. Any suggestions?!

I understand the problem just not the severity of it. You can still text but is it that you just want to know exactly when someone opens up the msg?
I personally don't use Imessage but if you can't get it fix you two could use the KIK app. It does the same thing as imessage basically.

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