Okay, what I don't get is that you say you're in a really toxic relationship with someone who treats you badly the majority of the time, but you only want advice on this one issue?

If he is such a bad person, does it *matter* if people give you good advice over this? He will either not respond reasonably anyway, which means it doesn't matter what you say/do. It'll be hard to accurately judge why he is being like this, because to understand that would be to know his toxic midnset. 

And even if you do fix this, he is still gonna be a shit about other things. Why are you still with him, if you believe he is toxic and he treats you terribly 90% of the time?

And of course it's not normal. It's not his money, it's not money you and him share, it's not money that you need to be putting towards a future together right now I assume - so no, he doesn't have a say. And even if he *did* have a say, being mean about it isn't the way to go.