I recently asked if she could pop a zit I couldn’t reach on my back, and she said she “preferred not to, as it’s a bit gross”.

Should I break up with her?

If you're ever having children, there will be many things that are "a bit gross", be it in pregnancy, during childbirth, after childbirth or just diapers.

She'll (rightfully) expect you to deal with all that, right? If pimples are where the "that's gross, not gonna do it" line is, things will get rough.

Disagree. I have done and seen some nasty shit in my years as a husband and father (including the birthing of my children) and dog owner, but I would never pop somebody’s zits.