So at my bfs house (where I live) they have 2 bathrooms. One has just a shower and the other has…

So at my bfs house (where I live) they have 2 bathrooms. One has just a shower and the other has just a bath tub. They haven't used the bath tub in years. So I decide to clean it out bc I'm in need of relaxation rn. & I realize as I'm done for some reason the water won't get hot .. I'm so mad. I did all that for nothing & now my back hurts worse.