What am i missing?!

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I am the eldest child and I have always taken on this role as seriously as I could. Straight after college, I helped the family as best as I could. My siblings and I had the agreement that we would not let our parents pay another bill after we get jobs. When my sister got a job, she became my comfort since she helped me with the bills around the house. We agreed that we would split the bills equally every month. My brother got married a couple of years after finishing college and started his own family. I am fond of buying things we need around the house. I bought a widescreen tv, cd players, a computer and an oven among others. Even if I had to get these things on credit, I never asked my siblings for help in paying for these appliances. I felt that it was my decision to buy them, so I would not bother them with the bill. I still kept giving my share for the house and never missed a single bill. Lately, my sister insisted on buying a new couch. Since the couch we had really was ready to retire, I told her it would be fine. We had the agreement that I would pay for her share on the bills and she would pay me back the following payday. When the couch arrived and I reminded her that next month she would have to shoulder all of our bills as I did the last month, she got angry and told me if she were to pay all of our bills, I would have to at least give her half of what she paid for the couch. She was offended when I told her that I did not do that to her when I bought the tv or the other things I bought for us. She claimed I was throwing it at her face that I bought these things! Am I missing something here? Am I wrong? I just started on a new job and she now makes more than I do. I had to get money from my emergency fund just so i could pay the bills last month and she doesn't even think that she had to pay me back! Am I at fault here?