What in life can love not penetrate?
One day spent with someone you love can change everything.
There is no formula to relationships.
Nobody's favorite movie is some dark, dysfunctional slasher story. Everybody's favorite song is a sentimental song. So why all of a sudden is it bad to be sentimental in books?
Lost love is still love. It takes a different form, that's all.
In order to move on, you must understand why you felt what you did and why you no longer need to feel it.