Text Messages won't send to one person...HELP!

[brina_83]

For the last 2 days when I send my bf a text he doesn't receive it,  I get the messages he sends me. We have no problems calling each other.  He has an android and sprint service and I have an iPhone 4s and Verizon.  I have tried everything, removing his contact and re-adding it, even a reset on my phone.  He used to have an iPhone and has unregistered his number per Verizon suggestion, and still not working.  I have turned off my iMessages.  I can text him via google voice, and is the only person I am having this issue with, we checked to make sure neither number is blocked, it just doesn't make any sense!!

Can anyone help?