What does it mean when a guy doesn't text you back for 3 days?

Okay so there's this guy that i like. He is always the first one to text me first. He replies back to my messages every couple of seconds. I remember i didn't text him back for a day simply because i was busy. So like we both have Iphones and we havd the Imessage thingy his normally says read when he reads my messages but when i look at my messagei sent him it just says delivered. I'm not sure if he deleted my message of something happened or if he is being an @$$ by not replying to me. The message i sent him is really simple i sent the message "Hey" to him.

FFS, get a grip! One text? He could well have missed it, or gotten it confused with another text perhaps. Take the plunge and ask him out, I dare you:-)

I had the same problem but I was the guy ignoring I thought she never told me she had a girlfriend and I though she led me on and now its a big mess. Finally she is starting to talk to me, but she is a force to be reckoned with.
btw she put boyfriend and I thought It meant boyfriend but it meant best friend so I fuuuuucked up… Anyway make sure you didn't put something that maybe he misunderstood… Hope this helps.

I agree with Richard.