Don't cry because it is over, smile because it happened!
Letting go, even if it hurts, doesn't mean you have to let go of everything. You just have to let go of the person and your feelings for her/him but the memories will always be there whether it's good or bad. Because everytime you remember those memories, it will always put a smile into your heart. And be glad that once in your life this person made you happy and put colors into your life even if it's just for a while.
I like to pretend that everything's alright. Because when everybody else thinks you're fine, sometimes you forget for a while that you're not.