When you get married your debt is their debt, and their debt is your debt. You can slice it however you want, but my biggest recommendation is getting on the same page financially.
Realize a marriage is not 50-50, it is 100-100. It is important to realize that you should expect to give 100% without expecting anything in return.
Whether you are marrying someone with student loan debt or credit card debt, you still need a long term financial plan for your future family.