My little brother had both arms smashed by a drunk hit-and-run driver. One of his "boring" ex girlfriends, who had stayed friends with me, came and took care of him. That girl wiped his ass every time he went to the bathroom, for about 4 months.
As long as we are together I would try to take care of them. Sometimes you end up doing more than that in a long term relationship. There are a lot of medical issues that are a lot more gross than snot that they may need help with eventually.