Now that most communication has become texting, mutual respect has become quantifiable.
You can tell when you are taken for granted. Or when someone is texting you only when they are lonely. Or need something. So these guidelines maybe handy.
Never text someone who has Seen more than three of your messages but hasn’t replied. You don’t want to be the person who is “always texting”.
Never text someone who doesn’t bother replying to you after the third time it happens. (I keep it at three strikes, you can set it a frequency depending on your equation with the person) Let the other take the initiative. You don’t want to be the person who is putting in all the effort all the time.
If someone always replies to you late, they probably have decided that’s the frequency of communication they prefer. Follow the lead. You don’t want to make the person feel you are needy. Or too eager.
Yes, some of us text more and some of us keep it short. So do not read into volume of communication. But always pay attention to expressing genuine interest if you keep it short. Esp. if you keep it short. (When you say K, it is usually reads as Fuck off.)
Nothing lasts like mutual respect. All relationships, especially friendships today, need to be equal to be healthy.
Don’t be taken advantage of.
Don’t mislead.
If you are asking someone you have never met for coffee, never ask them more than once. Wait for them to ask you the next time.
If you don’t keep it at equal, you can’t have a healthy relationship or enjoy mutual respect.
P.S: None of this applies to the asshole best friends we made when we were too young to know what’s good for us. 😃
MADRAS INK. 
Though I take care on similar lines with regard to texting.
But kudos to you on defining it crisp and short in words .