I believe if you’re looking for a partner, you should expect him to give you all of them self. And that is precisely what a person that is unavailable cannot give you. 

An unavailable man can come in many forms.
He can be either...
Emotionally Unavailable or
Legally Unavailable or
Physically Unavailable
But it not limited to those three types.

Humans are creatures of habit. That is why in our lifetimes we will have repeated nearly every activity at least twice. There will be at least two days in your life were you will do the exact same thing. And they're will be at minimum a zillion and one times that a woman has taken that no good guy back!