Our feelings are only temporary and uncertain

Our feelings are only temporary and uncertain, feelings only occur momentarily at certain moments, our feelings can not determine what is good for us in the future, we can only feel what is happening now, and especially our feelings are often wrong in making choices , I have a friend who had a crush with a woman and she said "very lucky yes her boyfriend, if I'm going to be her boyfriend would be really happy", a few months later the woman broke up with her boyfriend and invented with my friend then not until the year they break , the irony is that my friend who originally adored the woman even hated in the end. The point is that our feelings are easy to change and very short term.