I found the paragraph about chill interesting, but I'd like to say that

not reply to texts for days because you are receiving too many

This is bullshit and everyone knows it. A similar maxim: we all believe the person we desire is having sex all the time, because we want to be having sex with them [and are insecure about it]. In reality, it's simply not true. No one's bringing home a new guy or gal every night. Most people really don't even want to.

The person who doesn't reply for texts for days isn't doing so because they are so popular they are overwhelmed by their texts. I've never known anyone to experience that or profess to experience that. The person who doesn't reply to texts for days in general is a shitty person who doesn't want to be your friend even though you would like them to be yours.

This article seems to say that "being chill" does not depend on the person that you are. But of course it does. A girl who is chill to me is not chill to the guy she wants to bone. She's chill to me because she has enough friends and I don't matter. But she's sure as hell not going to forget to text back that new codpiece.