Why do men marry women?

In my house, I don't work because I have a disability, and my boyfriend does. He does the cooking, shoveling snow, food shopping, etc. But I do all the cleaning, the laundry, take care of the finances, etc. He pays for more than half of everything around here, because I only collect from social security, which sends me a check of less than seven hundred dollars a month. The reason I know that we are still living here together after ten years is that we love each other and we have a mutual respect for each other. My question to you is, why would women want to marry some men when not even ten percent of then men that I've ever met have been mature enough to even marry?