I think the trick is to remember that as the relationship goes on, this can ebb and flow. My girlfriend and I share chores in a fairly organic way, there is stuff she is inclined to do and I have things I tend to do, but sometimes one of us falls off a bit (I mean for more than a day or two, more of a mini-era), and I think there can be a moment of feeling frustrated about it but if you take a pulled back view of it all you realize that people just go through life in waves, and it's important to be supportive but also not let someone fall completely off the track if it seems like they just stop caring.