"He's just not that into you!"

So a friend of mine recently leant me that book He's just not that into you!  She is recently out of a long-term relationship and is now a year or two into a great one!
She told me to have a look, it made her feel better before she broke up with her old boyfriend.

I brought it home, put it on the coffee table and there it sat for a few days.  Then I picked it up.......

If my friend was telling me about her bf troubles, I would say "seriously, he is just not that into you, and you need to move on!"    Why is it so obvious to identify in someone else's relationship/life but not your own?!  There I was reading this book thinking, "OBVIOUSLY he is not into you if he does __________."
Yet here I was, for so many years ignoring those same things in my own guy...  :(

On Saturday night I went out for a friend's birthday.  Trouble is, her bf is one of 'his' best friends.  I sucked it up, looked cute and to the bar I went!  Some of my friend's bf's friends were there (follow me?!)  who I had met a time or two before, but did not know well because there were not really friends with 'him.'  
Anyway, these 'friends' were into me, and I could soooooo tell.  Were they just WAITING for me to be single?!
They have both added me to fbook and bbm, and although I have ZERO interest, I thought it interesting that we can easily tell when a guy is into us, but don't see (or choose not to) when he is not.

Clearly they knew could tell who I was.


xoxo
Little a