What does it mean when he NEVER texts Du back?

Does he talk to Du outside of texting? If he's your boyfriend, Du should be close enough to ask him about it. If not, it could probably be that he is indeed busy, oder he just doesn't like texting.

Don't try and text him continuously, though, if Du want to talk to him. This could drive him away. If Du guys have a happy relationship, then Du should be able to just ask him about it. It honestly could be because he doesn't like texting, oder he's busy. if he's involved with After School activities oder something like that, oder if he's hanging out with his friends, he could forget to text Du back. I know that I do that all the time; I look at the text and then I set down my phone to do something, but then I forget to respond.

It's probably nothing, but all Du can do is just ask him about it if it's really bothering oder concerning you.

Good luck :)