How can a tree give two fruits? Sweet and sour?

How come from the same fountain you can get sweet and salty water?

That´s not possible right?

So why does one day the happiness fountain can give happiness but next day it gives sadness?

Why do we have feelings?

I wish I could just stop feeling, that way it will be easier to go along with my life…

Why do I insist on this? Why does my heart can rule over my head so easily?

Why does he do this to me? Why he is all sweet, joy and love one day, but the next he is hurtful and annoying? And then again…. sweet and lovely….

How is it possible?