In Buddhism, feelings are predestined, and everything is cause and effect, the cause of past lives and the fruit of this life. If you plant good causes in previous lives, you will get good results in this life; Sow evil causes in previous lives, and get bad consequences in this life.
Whether it is love, hatred, the intervention of a third party between husband and wife, etc. All this stems from the fate and cause and effect of previous lives. In short, good karma and bad karma are "debts". Because you were kind to me in the past, I will repay you in various ways in my life, even if I bear the burden of humiliation and be a cow and a horse. Because you abandoned me, I have a grudge against you all my life, even abandoned you, abandoned you; Because you have hurt me in the past, I will repay you with my life ... and so on, all of which are causal.