Just wondering if I am overreacting any opinions would be very appreciated?

I will try keep this as short as possible my partner has a project car. I love that he has this project and I try support it as much as I can but over the past few months he has putting all his money towards the car and leaving no money for anything else. I find I am left to make ends meet with bills, rent and groceries. Anytime I try to talk to him about it I find he gets very defensive and says I’m against his passion but really I am just sick of everything being on my shoulders financially as I am getting quite stressed out.
I want to fix this issue but I have no idea how to approach it without him thinking I have a problem with his passion. Thank you so much in advance :)
Just wondering if I am overreacting any opinions would be very appreciated?
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