Love for hire

Will I ever be able to stay interested in a relationship?

Becoming that monster I'd sworn never to be
I'm a lost cause,
You don't need me
I stumble through the darkness,
Killing until the first signs of light
Love for hire,
Like a tattered spire,
I'm barely worth the fight
As all else fails,
I've withdrawn my sales,
For the price will never be right.

If you wager on me, be sure to flee
For my love never lasts the night.