When you fall in love with someone you can love, the whole world opens a window for you, and birds and flowers are everywhere. When you love someone you shouldn't love, no window is open anymore. No matter if you light a fire or freeze it, you will suffocate to death in this space with no way out.
The most painful love is knowing that the fields he gives you will never have a good harvest, but you still love him. You can't say anything good about him, but you still care about him and can't forget him.