My Sister's Coming Wedding

My mother told me that one of my sister would be married in May, this year. I was surprised that she made her decision so soon, because last time she talked with me, she said that she had not accept him to be her boyfriend. She is the same age as me. In my hometown, it is a little early to be married at my age. I was confused whether she had carefully considered. However, she told me, in her opinion, the one to be married maybe not the person who you love most, but the person who love you more and cares about you. I do not know which person I would marry in the future, the one I love or the person who loves me more?