letting go

I was listening to a song by Birdy and Rhodes entitled 'Let it all go' and it got me really thinking.
Why is it so difficult to let go?. Be it your favorite torn tshirt, your old dog, your old now so noisy car. It's just so hard.
And above all..., why is it so difficult to let go of our loved ones, even when the spark is gone and the love has faded.

There are many cases all over the world, of women who each and every day experience abuse from their men. But they just wont let go. There are cases of when a woman realises that she's no longer loved at all, mistreated and not given the same attention as before. But they just won't let go.

Time after time it happens but then the woman is convinced that things will get better. But in actual fact they don't.

Is it the fear of lonliness? Is lt the fear that if one let's go, they'll never fall in love again?

http://t0.gstatic.com/images?q=tbn:ANd9GcSRQX77-SrrmsC6_l4fB1mf38_QHNGr3Cp8LUvX9bmU32hD2DTomlD0Ldk

Should one suffer in pain, trying to save a broken relationship, or a broken marriage or a broken friendship? Or should one learn to let to let it all go.
Birdy says in her song

"Who says love should, break us when we fall" 

Why should the end of love be so heartbreaking, shouldn't we be happy that we're letting go of pain and opening doors to better love?

"But if we're strong enough to let it in, we're strong enough to let it go"

For surely it requires strength and courage to let go of the person you've loved for years. But if its broken, let it go.
If it's not yours, let it go.
If he doesn't love you anymore, let him go.
Surely there's a prince charming waiting to cover your broken heart with kisses.