How to know if someone blocked you off their iphone?

My friend and I got into fight the other day, and ever since then I've been texting him but I never got a reply. When I send it, it says it's been "delivered." So I'm not sure if he blocked me or is he just plain ignoring me? I called him a few times too and it would ring a couple times. Just curious to know if ever got my messages or not?

You have no way of knowing. That is the best part of blocking someone.

You don't.

There's an option on imessaging to show or not show that you have read the senders message… If I wanted to avoid or ignore someone I would make sure it was at the setting where it just says message was delivered (even tho I can still read it, it won't say "read")