It'll come in time. Soon, all that tax money you think you'll be using for your new gun will suddenly be diverted to her new gun. Then you know yer good to go.
But, then you have to find ways to justify you getting new stuff as opposed to her. I'll suggest stashing a little cash here and there when you can and using that to get what you want behind her back.
She's doing the same thing to you anyway. You know this.