Okay. What is the crux of your issue? What would you feel in the event your girlfriend paid for something? What would you think about, and why is it such a discomforting prospect? You say you want to get better and not be so prideful on this issue, for the sake of your relationship since you know this bothers your girlfriend. That starts with exploring the roots of your feelings and your discomfort with this issue. If you are a logical man, you know that, realistically, nothing truly bad or damaging will happen. So why does it cause you so much discomfort? Imagine letting it actually happen, and then the aftermath. What does that look like to you, and what makes it so bad that you let it turn into a fight.
Okay. What is the crux of your issue? What would you feel in the event your girlfriend paid for something? What would you think about, and why is it such a discomforting prospect? You say you want to get better and not be so prideful on this issue, for the sake of your relationship since you know this bothers your girlfriend. That starts with exploring the roots of your feelings and your discomfort with this issue. If you are a logical man, you know that, realistically, nothing truly bad or damaging will happen. So why does it cause you so much discomfort? Imagine letting it actually happen, and then the aftermath. What does that look like to you, and what makes it so bad that you let it turn into a fight.