Dear Consenting:
Mostly, I suspect you're not going to solve this problem to your own satisfaction, and this relationship is doomed.
There's a wide variety of creative solutions you could deploy if you're fine with clever manipulations: for example, you could tell your priest about your situation and that you intend to pose as a heretic, and then allow your boyfriend to discover your apparent heresy, after which he'd think to have the upper hand on you.
But ultimately, what we have a situation is where your boyfriend is weaker and less daring than you want your man to be, and I worry that even after you're done with clever manipulations, you'll still feel dissatisfied, because the ultimate problem here is that you are in some sense consenting.
You don't have to end this relationship while you look for another one! Secretly flirt with dangerous, strong men until you find one that's good at hurting you, and values the way you hurt for him enough to tear you away from your current boyfriend whether you like that or not.