Do explain this to me?

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So this girl is still bugging me to move in. First she said rent would be $500 per person, now $500 for her (and 3 kids), and $500 for me. Right there why should I pay for her kids, she should pay for 3 kids, I pay for me end of story. I said for not even $700 a month I can have a mobile homes. $380 for park fees, then a mortgage. Now I am trying for fall to have at least 75% put down so it will be even less money. She then tries arguing with me saying $700 per person have a whole house, which you rent. You don't even own, and have to put money into it, and not get anything out of it. She doesn't want to leave the city she lives in, well I live here 45 minutes West. I work here, and wont be trying to find other jobs. She goes I wont find a job there, now she is 32 and has only worked at Timmies, she started working at 24 years old and work a few years, then started havings kids and depending on a man. Now this isnt my fault, I can find another job because I have work experience, and widen my education and worked in these low end jobsfor years.