<human>: Can you provide a brief overview of the text?

Let's just start this by saying this is one of the hardest things I've ever encountered. I met my wife through a mutual friend. We hit it off and things went very well for the first 3 years we were together. I moved in to her house after my roomate/brother joined the Coast Guard. 
I took in her son as my own, but I knew I was ready for a family. I am human, and I made plenty of mistakes going into parenting. As finances became tighter after our daughter was born, my wife decided to start exotic dancing to supplement our income. I'm a contractor and a pizza guy who makes a little under 700 a week working mon-Sat. As time went on, I realized just how bad off things were getting between us. My income and parenting became her primary focus, and from then on, I became the whipping post for her many mistakes like multiple car accidents and sending texts and selfies to potential "clients".  I think this has eaten my soul away.  Problem is, I'm the one who's in the house and the one taking care of my children while she stays out all night drinking a bottle of vodka in 4 days.  I can't win. No-one, not even her family, can get her to see her lack of care and understanding. She pays for everything. She's a very attractive woman and now I feel like a kept husband, who's not a husband, but a glorified babysitter with no choice. 
She's got a track record, and I cant bring myself to break away from her because I don't know who's going to watch my kids when I move away.  I'm so depressed living in the house we grew together in with no signs of her love.  No affection returned for over 4 months had driven me to look elsewhere. I don't like living under her black cloud of lies and late nights. 
I don't know what my next step should be. I still love her, but my hope is fading as she's pursuing the darker side of life while leaving me in the dust. Any advice for a sad soon to be single dad?
<bot>: dancer wife pays all bills, leaves me with kids, discredits my contributions and wants a divorce to pursue the unknown.