My boyfriends credit card always declines, do I have a right to be mad?

Anonymous
We went to get a gift for his friend, and I have to pay because his card declines. 20 minutes later he goes on a shopping spree in the gun store while I sit and watch. His card declines again, I have to pay. He acts like it is not a big deal. This is like the 10th time in 6 months. Why does he keep buying stuff? What if I didn't have the money to pay? I got angry in the gun store, told him this was the last time I was doing this as people stared. I know i might have embarrassed him and myself but I was angry. Do I have a right to be mad? I am livid. I don't do this, why doesn't he keep track of his funds?
Updates
+1 y
He's a psychologist, but out of work right now. He spends so much money and complains about running low on funds. His card keeps declining. He paid me back this time but it still annoying. Seriously, it's happened a lot at dinner too. What if I didn't have 70 bucks to cover the expenses he runs up? Its the principal.
My boyfriends credit card always declines, do I have a right to be mad?
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