Am I wrong?

Me and my boyfriend are both into shit play. He shits on me. I shit on him and we eat each other's shit and smear it on each other. I also enjoy buying other people's feces online and have jars of it in my house. My boyfriend said he doesn't need anyone else's poop. Just mine. He is fine with me smearing other people's poop on me while he fucks me but all of a sudden he also wants to buy other people's poop online. Including shit from other girls.... I know I do it but he said my shit is the only shit for him. Why the change up? Am I wrong for being upset?