I love Eckhart Tolle's book 'A New Earth':
I used to be VERY emotional when I was younger until I read this book and started getting into the mindset of the ego and how to control my thoughts. I suggest it to anybody who may have some dark feelings within themselves whether it's depression, fighting, internet trolling to feel better, etc. It makes you put aside the petty things... even a sad song like the OP described. It makes you want to rid of everybody in your life that you may view as clutter... you just don't care anymore. You really only care about being happy and not caring about drama, crap, politics, celebrities, goods, etc.
Now when I have somebody approach me with drama trying to fight with me, I have no use for it. I have the ability to not respond, delete texts, not respond to calls, and then clear it from my mind. They are miserable because they are not having their ego fed. I am happy because I just don't care.
And by the way, it's called a "shift in conciousness".