My phone is no longer displaying if my messages have been delivered or read with a specific person

[AC Question]

My phone is no longer displaying if my messages have been delivered and or read. I've been texting a specific person and its always worked until yesterday when it stopped working. It would no longer say if my messages have been delivered and or if they have read it. It was working perfectly fine and would show if my message has been delivered and or read, but now it's not working at all with this specific person , but it works just fine when I text other people.

 

[B. Diddy]

Welcome to Android Central! Which phone, and which texting app?