Should I leave my girlfriend/ fiance' ?

I have been living with my girlfriend for almost 9 years. We met on a chat line when I was still married and admittedly cheating on my now ex wife. My divorce was finalized about 3 years ago. My girlfriend and I have been living together since 2 weeks after we met and for the 1st six years I was still married to my ex. MY heartache come from the fact that she has 2 children 17 and 19 years old. Her 19 year old son dropped out of school 5 years ago and has a drug addiction and refuses to pay room and board. I have a problem with this because I was raised by a single mother and payed room & board and have worked full time since I was 16 years old. I own a successful company and my income is about 150k per year (including housing benefits etc). so it's not a case of needing the money it;'s really the principal of supporting a soon to be 20 year old kid who has been looking for work for 6 years but due to his addiction and lack of education is unemployable. My girlfriend dropped a bomb on me last week when watchiing the television show 16 and pregnant and she told me "if any of my kids have children and can;t take care of them I wouls adopt them" - I didn;t say anything but internally I had a meltdown, I am 45 years old and supposed ot be enjoying life. On top of this my girlfriends 16 year old daughters friend had a baby she abandoned and the baby has been living at my home for the past 8 months. Essentially I am supporting my girlfriend (although in her benefit she has a small income of about 2000 per month). My life as I dream of it involves a small condo with a gust bedroom for the kids to visit. today I have 3 kids living with me that dropped out of school several years ago and contribute zero to the family bills and on top of that an infant baby. My girlfriend is a saint for taking in this baby. I give her credit but I was never once asked my opinion nor permission to have this baby live with us. There's alot ,ore to this story and there are 3 sides to every story as we all know. But I;m ready to pull the plug and just leave them all due to thier lack of consideration and respect. Also they have 3 dogs that have pretty much turned my house into a place that smeels like urine and feces 24/7. We live in a beautiful home but there are an average of 2-4 friends sleeping over every night without my permission and half the time without my knowledge. I world 50-60 hours per week and am really getting sick and tired of my house being the community center for everyone in the neighborhood that is uneducated , unemployed and hooked on drugs. I want out but don;t want to be that guy that left a single mom high and dry. Is this bad karma coming back to haunt me for my sins of 10 years ago? I posted this question earlier and the consensus was to call for a family meeting. Today at 3Pm her 19 year old son was sleeping on our couch after being up all night and I told him "I guess your not looking for a hob today" - shortly thereafter I overheard my girlfriend telling her son that she caught me sleeping today also (I work from home 50-60 hours per week and was taking a nap at lunch at my desk, I usually never even take a break and I work straight thru lunch. My point is that is typical,, whenever I try to say anything to her kids that live under my roof to do something productive she gets in the middle of the conversation/situation and is 100% of the side on her children (both who have dropped out of high school 3+ years - the 19 year old never completed 8th grade, there are truant laws in Florida that hold parent accountable and I have no idea how these 2 kids slipped thru the cracks without any repercussions. The younger child is 17 years old and hasn' attended school for 3 years and also has never worked a day in here life. After the situation today I said we should have a family meeting and my girlfriend told me in some other word she would simply move out. 2 hours later she is kissing me telling me she loves me, I tell her we still have to address the problems I mentioned above and was told be her that he has too much on her mind and didn't have the time to discuss. This has been building for at l;east 3 years at this point and the disrespect in my opinion is getting consistently worse as far as sneaking in kids to sleep over 7 nights a week, on an average night there is between 2 and up to 4 random friends sleeping over without my permission and often i is on my sofa in the middle of the house not even in their bedrooms, when they have 3-5+ friends sleep over her kids sleep on our living room furniture because their room is full. Am I wrong for being resentful for having kids sleeping in my house and watching television at 10am, noon 2pm basically all hours of the day and night non stop- none of them work and 75% of them are hooked on oxycodone.She has a Small income but hasn't worked in over 7 years when she was 27. Should I get the hell out ? Any comments or advise woul