I Owe Her 800K... After Giving Her My Pay?

After graduation, I struggle to find a job, while my girlfriend easily lands a position at a major company. She has been with me for two years, and to cheer me up, she even lets me hold onto her payroll card. Once I finally start working, she worries about my long commute and immediately buys me a car. Everyone around us envies me for having such a thoughtful girlfriend. To save up for a house, I secretly deposit my salary into her account. A year later, we decide to get married. Excited, she grabs my hand and says, "I know you don't have much saved. I don't need any wedding gift. All I want is your love." I am deeply touched by her consideration. But on our engagement day, she pulls out photos of me with a dozen women and accuses me of cheating. I look closely and realize I have never even met any of them. Then she shows me my card's transaction history, filled with charges at the notorious Solara Club. "You had my payroll card, and you used my money to indulge yourself!" she cries. "I'm not marrying you. Return my car and all the money you spent over the years. It adds up to 800 thousand dollars." I calmly place the payroll card she gave me on the table and say with a smirk, "Fine, let's settle this properly." When I present the detailed account prepared by my top lawyer, she is stunned.