I don't understand why you aren't allowing her the opportunity to feel like someone's beloved girlfriend. Is she an ungenerous woman? Perhaps without your being so unwilling to act in the traditionally male role, she would like the opportunity to spoil YOU a little, too. This isn't a financial issue for you, so I don't understand why you don't take some degree of pleasure in being generous. It's weird.
Relax... I'll need some information first. Just the basic facts - can you show me where it hurts?