Rebirth Revenge? No, I Watch Her Choose Wrong

"My best friend has always been stingy to the bone, so the moment she volunteers to buy a bottle of water for the heir to Bellaris' most powerful family, who collapsed from heatstroke, I know she has been reborn, too.In my previous life, she and I sat for the college entrance exam together, and when the results were announced, we both got the same high score. Both of us had our eyes on Kingsley University, yet the admissions quota was limited, and neither of us wanted to jeopardize our friendship, so we kept delaying our application. In the blink of an eye, it was the last day to file our applications, and as I was about to start on mine, I stumbled upon the heir to Bellaris' most powerful family, who happened to be suffering from heatstroke. I not only bought him a bottle of water, but I also held an umbrella over him until he came to. By the time he regained consciousness, I had already missed the submission deadline. My best friend submitted hers just in time and got accepted into Kingsley University. Because I never submitted mine, the opportunity to attend university slipped past me.However, the heir apparent was touched by my act of kindness, and he asked for my hand in marriage. In the end, I married him and became a socialite, whereas my best friend, despite getting into Kingsley University, was overwhelmed by the demanding curriculum. Watching me live with more money than I could spend, she was fueled with jealousy until one day, she snapped and stabbed me. The moment I open my eyes again, my best friend and I are back on the day the heir to Bellaris' most powerful family passes out from the heat."