Do I have to fix it?

[Kay W.]

I have a question to ask all the landlords out there.  I have a tenant who has accumulated a lot of mold on top of the bathroom ceiling.  He kept on asking me to repaint the bathroom because it was dirty and it was peeling.  I explained to him that I don't repaint because it's dirty and also the dirt is from mold that can't/shouldn't be repainted over.  

Judging from signs around the bathroom, I sense they are taking very hot showers and it's causing peeling in the paint on the wall and also mold and mildew.  I helped them wiped down the mold and mildew but the paint is still peeling.  There is a ceiling fan in the bathroom but I have a feeling they aren't using because it's generates cool air.  

In this case, am I responsible to repaint their bathroom?  What would everyone do in this situation?