That is a bit mess up not gonna lie, so he really is cursed to not be horny in every woman in the world unless he is able to paint the witch beautifully, that's just making him a eunuch at that point.
Trash boyfriend reminds me of John Cusack in High Fidelity. Then he had the gall to spread rumors? ngl I hate when manga students spread rumors without making any effort to confirm them. Put'em in a porta-potty and tip it over.