Q: Not receiving texts

Hello Tmaz24,

Thank you for using Apple Support Communities. 

I see that you are having issues with sending/receiving texts from one particular user. I would suggest taking a look at the following article for suggested troubleshooting:

If you can‘t send or receive messages on your iPhone, iPad, or iPod touch

Specifically the following section:

If messages won't send to a certain person or you need help with group messages

Sometimes your messages won't send to a particular contact, or you might have issues with group messages. For example, you might reply to a group conversation and receive your own message. Or you might get a new phone number and see your old one listed as a recipient in an existing group conversation.

Delete the conversation* that has the issue and start a new conversation: 

1. Open Messages and look at your list of conversations.
2. Swipe from right to left on the conversation you want to delete. Then tap Delete.
3. Open Messages, tap , and enter the phone number or email address of your contact or contacts. 
4. Write a new message and tap send. 

Best regards.