Texts stopped going through to US number

[Ashleede]

Hey there, I have been able to text my friend in the states without issue for a few days but now when I am texting they are not going through. I have been able to recieve msgs but they are not recieving them. We are both still able to send and recieve from other people, just not each other. 

I havde tried rebooting my phone, nothing seems to fix the issue. 

[Ashleede]

I confirmed with them, they definitally did not block my number 🙂 

[Ashleede]

Like be sure they did not accidentally block my number? 

[Luddite]

Be sure their number has not been accidently blocked.