NEED help. MAN IN NEED?

My girl friend and i have been dating for over three years now, i have know her for over 40 years ,our fathers were best friends when we were baby's. They are both no longer with us,. We were both in different marrages that just did not work.I did some repairs in her house,that's how we hooked up . In the three years i have watched her son for her while she went to work, took care of his homework, fed him, made sure he had every thing that he needed. I have bin the only true father in his life ,I do more then his father does,he just leaves him with his mother while he goes out on the town,I do all the repairs, put in a new roof , fix the boiler,added a new bathroom,pay my half of the bills, i sometimes cook diner,make sure see is well taken care of ,But she always has an adatude ,the only thing that i ask for is a little bit of time for me to watch television ,I work 12 to 14 hrs a day, some times i do not feel like going out, but then she gets made if i don't go, I feel like so is to controlling ,when i talk to her ,she tells me that that is how she is . I have tried to leave her but then she make it hard she tells me that i can not take my stuff, that she will call the cops and tell them that it is hers.I really don't want to leave, i want to just live normal ...WHAT SHOULD I DO? PLEASE HELP!