my boyfriend wants to wipe my ass after shitting his pussy after kissing me so much. It should be easy to explain this to him, because he is an idiot." So here's the thing, if you can't make your partner do something (like the "shitting your pussy after kissing me so much," above, is a pretty common enough thing to do), what are you doing? Making your partner do something that is going to make them do it? You're going to ask him to do something? That's just a terrible way to be treated. And don't get me started on the "I'm an idiot so I can't just show him a fucking video of me and masturbate to it."
You make it very clear that you don't want to be with him, and that you need someone else who doesn't want to be with him. This is incredibly damaging to a partner's trust, and it makes them wonder if there could possibly be anything good that could come of having a significant other.