Should I continue with this?

My g/f and I are both 31. We are together now for about 2 years. We are thinking about getting married but we are first thinking about getting a house. Right now I know I can't afford a house on my own and this is where my problem is. We want to get married because we know her biological clock is ticking and we want to have kids at some point. We are both working but she believes that the guy should provide for the family. We both live separately in our parents' home. My question is: should I continue with this relationship or should I end it? I am not in a financial situation to afford a house at this time with my current salary. She works for a lot more than me and I think because of this she has grown accustomed to living a more lavish lifestyle than myself. She is willing to help with some of the costs but even with this I still will not be able to provide for all her wants and needs. I am currently working on starting a side line business in addition to my 8-4 job. What should I do? I love her dearly but I do not want to waste her time so to speak.

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