Nothing wrong with acknowledging that you've made a mistake and moving back to Texas. 

"he has never stood up for me on anything"

Why would you bother squandering any more of your time on such a waste-of-space? You are being used big-time! You take care of the house (why did you start doing that?) and all that entails and he treats you like a skivvy. Do you really want to live in a place with two extra adult millstones? I hope you aren't paying more than 25% of any of the bills? You realize that he only wants you around for your housekeeping services and sex, don't you? Because all of his other needs are being met by his offspring. This will never get any better.

I suggest that, as you pack your bags, you google "emotional incest" because that's what you're dealing with. Go back to where you're loved and appreciated and chalk this mess up to experience. You deserve to be loved for who you are and not what you can provide.

Well, now you know why this man was on the dating market. He's a shi!!y parent in an enmeshed relationship with his mini wife daughter, but selfishly still wants adult female companionship. This unhealthy dynamic means he isn't emotionally available, and I bet he's had other girlfriends who didn't stick around for long.

Instead of prioritizing the adult relationship and placing you next to him at the top of the family hierarchy, he caters to his baybees and expects you to be the side chick and maid, happy with crumbs.

There's no winnable solution for you against this sort of dysfunction. Even if your bf were to wake up and commit to change, you'd still have to contend with with his damaged offspring resenting you for being the catalyst for daddee growing a spine. They sound more like pouty teenagers than adults, and your bf obviously isn't willing insist they treat you with respect.

There's no shame in admitting you've made a mistake. Well adjusted people don't always recognize dysfunction for what it is, and long distance dating makes it easier to hide the crazy. I think you should quietly put together an exit strategy. Say nothing until all your ducks are in a row, and then get far away from this weak man and his stunted adult kids.

Back to Texas.  Leave the love birds back in Maryland.

The adult SD is the least of your worries. Your boyfriend sounds like a jerk who treats you poorly. Why be with a man who treats you like you don't matter? Especially one for whom you turned your life upside down by relocating? Leave him ASAP. Cut your losses.

I think my fellow members have put it very well and I agree with each one of them - don't waste another week of your life with this twit and his awful daughter. Chalk it up to experience.  

I also agree with everyone else. You made a mistake, lesson learned. It's time to move on and get away from this situation. It is never going to change because neither SO or SD want it to.

There are posters in here with adult mini wives and it doesn't get any better.

I feel ya BTDT. It gets worse because gradually you realize you were duped to be with a man already taken. You are there now, step one completed.

Step 2  Texas here I come as you shout FREEDOM into the air.

Step 3 you build a happy life for yourself and step shit is a distant nightmare that you will never forget, but more importantly you will never repeat.

Lady, life is full of lessons. We learn, we grow, we triumph.

Blessings to a better life.

That he allowed his adult brat to treat you like that and allowed you to continue to be treated like that.

You asked for help, well the only thing I can suggest is that YOU make some changes. He is not going to change. The skids wont change. YOU have to make the  changes. It will not get better.

I dont know the financials of your situation, but the main thing is that you need to separate your finances. Get that job if you arent working. Get your financial ducks in a row. STOP doing for ungrateful people. Dont go out of your way for them. Dont do anything for them. They want to shun you? Well, go about your business. But if it were me I would be packing my stuff and leaving.

First, stop trying to please this man and his offspring. You can't. Be aware that it's not you, personally, it's any woman with Daddeeee.

Second, figure out what YOU need to be happy. Assume this man will not change. If, by some miracle, he does agree to move you to partner status, expect tremendous objection from the skids and backsliding from him.

Third: don't accept status quo. Once you figure out what you need, take action to achieve it and don't let anyone stand in your way.

This sounds like a terrible situation with people who do not, and probably never will, appreciate you or value you. If you're going to partner up in life, it needs to be with someone who values you above all others. I say get out of this relationship, and build a better future for yourself. If you think we're all over-reacting, I promise you we are not. If you don't leave, it's most likely that you'll be increasingly unhappy in this relationship as time goes on. Days turn into months and months turn into years and someday you'll look back and think 'why did I waste all of this time'? 

If you think your SO could change, you could have one straight forward, honest conversation with him about what you need. Make it very, very clear. He probably won't be able to give you what you need, but at least you will know you tried one more time. After that, make your exit plan. 

He was enmeshed with SD.  I put up with it for 7 years.   I was in my 40s when I left.  I've been with the new man for almost 4 years.  He has 2 teens.  BF is a complete 180.  Sure it was hard to leave...but soooo glad I did.  Life is too short to be in a relationship when you're just the side-chick.  When you're just there to pay the bills and pass the time when SD isn't around.