Am I giving up too quickly???

Hi, this is gonna pretty complicated, I hope you guys can help. It is really hard to sum up in a forum like this. Ive been with my girl for 3yrs. She's been the girl of my dreams since I was about 12-13yo (I'm 31 now). She has a 9 yo daughter that I just love to death and she calls me dad. I'm getting pretty fed up with our sex life. It is once a month, twice if I'm really lucky and it's always the same routine. I tried to get a little variety in there but she hates it. We can't do anything too demanding either because she has a permanent knee injury. I'm really understanding of that last part. For the last 6-8 months I've been contemplating leaving her because I'm just not satisfied and whenever I bring up our quasi sexless life its always an argument ending nowhere. I feel I do more than my fair share to try and fix this problem. I try to surprise her, I bring flowers, take her to shows and dinner, I cook at least 80% of the time, pay for 3/4 of the bills, I take care of her daughter as if she was my own (taking her to practice, school, care for her), and I do anything physi cally demanding around the house because of her handicap. I do try to communicate a lot but she basically dismisses my concerns as just whining. I'm not saying sex should be a reward for doing this I just think that it could be a way to show me that she loves me and appreciates my efforts. I don't expect it everyday, I know our lives are busy but once or twice a week would be enough to satisfy me. This is where I add more to the equation and the event that is pushing me over the edge. Last week I received a distressed call from my sis who is a recovering addict. She sounded like she was in extreme need of help so I suggested flying her to my place (4 provinces away) so we could try to get her the help she needs. My mother-in-law who happened to be at my house for the week and my girlfriend suggested that I call the cops and let them take her to a hospital and deal with it there. I told them I couldnt do that so I had her fly in. Now for the next three days my gf was pouty and moody. So I finally approached her to give her some extra affection and try to talk a little about the situation. Well of course a fight occured and her mother happened to be nearby heard. I told my girlfriend that I didnt see the difference between my sister being here and her more being here. They're both "visitors" and that when I hooked up with my gf she was in a depression at the time and that I'm sure she appreciated the fact that I was there for her and that's what I wa s doing for my sis. SHe replied that when we met she wasnt looking for attention and not trying to use me and that my sis was only in it for a free vacation and did not look distressed at all and that this decision should have been a 2 person one. Then the mother in law started packing her luggage and wanted to leave 3 days ahead of time because I insulted her by comparing her to my sis and said "if you knew me you wouldnt say another word!" as I was trying to explain that I was just saying that company is company no matter who it is. Anyways, so I decided to drive my sis to my other sisters place thats 5hrs away, slept there and when I came back both my gf and my mother in law left along with her daughter and our 2 dogs. So now how can we ever have our families over after this. Both my sisters r pissed as well as my mother in law. Adding this to the plot, we had put in an offer to buy a house and it was accepted 3weeks ago. I don't think we should be together because of our difference in sexual needs and am not satisfied. Buying a new house together would also be disastrous. But if we dont stay together and move her daughter cannot go to her new school in a special athletes and studies program. I also dont want to lose her daughter because I love her so much and I have no rights because I;m not her biological father. What do I do???? Am I giving up too fast???

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