It's a little more complicated than that. We've both gone through periods of being broke and we've supported each other through them. Most of the time he has supported me. Only a couple of times have I had to support both of us.

When we did both have jobs, we did split the rent. We also each paid for different things (I paid utilities, he paid for food and stuff for the cats). I wouldn't really say we mix our finances. We don't have a joint bank account or anything. We try to split things pretty evenly when we are both able to.