First i would like to state a little bit of my history i was married with my ex for 15 years and we raised 2 wonderful children, we separated after 15 years but remained friends after that then about 5 years later i met another women whom i fell in love with she had at the time a 8 year old problem child with a previous ex and a 19 year old daughter from another ex (I should have seen the problems then but was in love so as they say.....)
after dating for a few months i felt i had really found the person i loved at the time she was out of work no income and 2 kids being what i describe myself as being a giver in a relationship i offered to help pay the rent and buy food and all, being single, with a high paying job,having a large house which i lived alone with my shared 2 children and having many rooms to spare i decided to ask her and her kids to move in. I did lay down some rules and regulations that her son and daughter would have to abide by, especially her undisciplined boy i also stated that since her daughter was an adult and working she should pay rent ($300.00 per month all included)i found this to be fair, i then proceeded to equip their rooms with computers, televisions and even PVRs I also re decorated all the rooms i prepared our new room with a plasma TV, HDTV and a Laptop computer for her, well here is were it all started to break down i found myself dealing with her 8 year old son who did nothing but complain about everything especially food, answer me back very unruly, breaking things in the house, not lifting a finger to help around the house etc etc, her daughter never paid her rent, invited her friends over for parties all the time kept her nice room in a shambles. At the time my girlfriend had a condition which she said prevented her from cleaning the house so I worked cooked and cleaned the house and all the while i never got any appreciation and her son kept getting worse and worse all the time eating everything in the house not leaving anything for the others,breaking everything in the house including my $1,000.00 home theater remote the computer which i had bought him, purposely annoying everyone being relentless in his whining and complaining whats worse the Mother never said or did anything!!!(by this point i was ready to kill him) this is also the point at which i really started despising him and would just ignore him, while i admit i did say cruel words to him i found i just couldn't help myself he just made my blood boil till i exploded i had never been like that with my kids nor with anyone for that fact, at this this stage my kids also started to come to the house less and less often (maybe once or twice a week tops, i should note that before they moved in they were practically always at the house with me) as they couldn't stand the little unruly undisciplined monster and they hated the fact that he was rude and disrespectful towards me, I kept telling my girlfriend that she would have to do something to change the situation with her children especially the demon child, this caused a lot of fighting as she would always defend her kids and just let them do whatever they please, her son was already in a special behavior deficiency program and in a special class almost everyday i had to leave work to go get him at school as he was intolerable there also, and again my girlfriend would defend him, suffice to say I did love her very much i put up with this for 3 years but i had become a different person I used to be happy laughing and generally always in a good mood. I got to the point where i couldn't even stand being near her children...i tried to do everything nice for them but i still felt alone i did everything and no one else in the house ever did anything I finally exploded in a fit of rage and threw them all out, but i felt bad that they had no money and no place to go so i took them back, I expressed and even begged my girlfriend for change yet it only got worse, to make matters worse my girlfriend never said anything nice to me she never said she loved me, never desired me in a sexual way, always said that it was my behavior and complaining that was the problem with her children she often stated that if they were my bio kids i would not react this way but i disagree my kids have always been polite well brought up and did not disturb anyone in the house, but she always managed to convince me otherwise, she also broke up my friendship with my ex-wife and her new husband, when i once asked her daughter to pay the rent as i had some rough financial times she packed her things and went to live for free at a friends house, my girlfriend then blamed me for the situation that her daughter left, I really could go on and on but suffice to say my kids my friends all said that i was being used, and she did not love me she was there because of self interest and the well being of her kids, i have always sort of felt this instinctively but i chose to ignore it she would then forbid these people coming over to the house, now i don't see my kids no more i have no more friends and i did the dumbest move ever in my life as she always said to me that she never felt this was her home and this was as she stated a big problem in our relationship, so I proceeded to make an offer that we become both owners of the house so we refinanced in both our names and she became half owner, by this point things did not get any better they got worse, she suggested that we get rid of my 2 dogs so that way we could have a nice home and yard, again thinking this would make things better i departed with my 2 dogs that i loved very much, as she now is working and owns haft the house every time i complain about her kids behavior in the house she says OK I will remove them from your hair i will leave and sell the house never once has she said that she would discipline her unruly whining lazy kid who is now 13 years old and deal with her daughter still does not pay anything or do anything around the house, I am living in a nightmare I am now faced with selling my longtime home, I believe i have been used as i did everything for her and her ingrate children and when i mention all that i did for her and her children she only replies with "oh yeah what did you do??" this enrages me as I know i did everything for her and her kids all the while she never did anything nice for me she even on 2 occasion totally forgot my birthday....so am i the bad person?? for doing every chore all the errands paying for everything for her and her kids and especially putting up with that little monster she does nothing about and keeps defending?????

Need advice
Thanks