Boyfriend's Daughters

In  the SHM Community Forums, Jimmy responded to the concern of one member who had some issues with her boyfriend's daughters. He answered:

Lori,
I want to welcome you to our forums and encourage you to keep coming back here (as well as anywhere else you can get support online). Your situation is one that is not right and it can be fixed. You are right about sometimes not being able to see a situation clearly because we are too close.
First, your boyfriend is giving you the evidence that he is an emotional coward. I cannot say for sure because I have never met the man. But he led you to believe his marriage was at an end and it wasn't. Many men who are emotional cowards do this because it is the easy way to catch another woman. They say their marriage is over when it isn't.
You have let him get away with it, probably because it is what you wanted to believe. Don't think I am siding with either of you. You are both have let hings float and not attended to them. But you are here now and you are trying to attend to them, so I commend you for coming here and writing about it. I hope you come back and let me know what you think of what I said above and also what I am about to tell you, below:
This situation with his daughter speaks of very poor emotional boundaries. He is letting her be a parent, and so are you. He hasn't stood up to her and he is a coward with her, too. She is taking advantage of this situation by throwing her weight around and pushing you aside, and out of his car.
The two examples you have given us are most assuredly only the tip of the iceberg. There probably is a whole lot more going on than meets the eye.
I would start looking for apartments. No need to have a big drama scene about it. Just leave the newspaper with apartment ads circled around the bedroom nightstand. Go look at a few apartments and find one that works for you. Tell him you want professional counseling or you will move out. Then move out next month if you have to. If he asks if you signed a year lease, realize that he is testing you and tell him yes.
Taking the backseat to 13 year old so as to avoid her pouting is where any self-respecting woman draws the line. Go to counseling and figure out how you got yourself into this kind of mess.
Think about it:  you are writing to say that you are not "allowed" to ride in his car anymore because a 13 year old needs to sit in the front seat. He is living with you, and you are sharing his bed and he hasn't yet divorced his wife. It is obvious to me that he is unmotivated to take care of you.
I hope you write back and tell us the answer to these questions:
Are you servicing him sexually?
Do you buy food that this 13 year old eats?
Do you buy food that he eats?
Do you pay part of the rent?
Do you pay the water, electricity or heating that he or she uses?
You said that finances are at a crisis point. They always are with men like this. If that eldest teen still gets to buy new clothes and go to the movies on the weekend, then there is money for couple's counseling. Most cities have low-fee clinics where you can get couple's counseling. You can go to a church, synagogue or temple and get counseling low-fee or free counseling there. Living in sin? Many couples are these days. That's no big deal to religious people.
Look at it this way: What's next??  If he refuses to take care of you, how can you take better care of yourself?