He has told everything you need to know. He isn't ok with you doing with your body whatever you want. Almost no one in relationship is okay with their partner doing “anything” with their bodies. Fidelity is the prerequisite to relationship, it's core feature. For him, you selling your pictures to people for their sexual needs is cheating. Frankly, I would do the exact same thing he did.
He has told everything you need to know. He isn't ok with you doing with your body whatever you want. Almost no one in relationship is okay with their partner doing “anything” with their bodies. Fidelity is the prerequisite to relationship, it's core feature. For him, you selling your pictures to people for their sexual needs is cheating. Frankly, I would do the exact same thing he did.