All relationships have one law : Never make the one you love feel alone, especially when your there.
I don't think you ever really do fall out of love with someone. You just get used to them not being around.
Never try to change a person. We all evolve as life goes on. Love people as they are.
Happiness is an attitude. We either make ourselves miserable, or happy and strong. The amount of work is the same.
No one should have the power to make you feel small. Remember, you are the one with the power to create your happiness.