There is nothing wrong with remembering. Just as there is nothing wrong with moving on. Those of us still here, those of us living, should never feel guilty about it, but instead realize that the dear ones lost would not want us to be sad or static forever. Because it is against everything that love is to stay in one spot, never ever letting time change, or change us.
In one of the stars, I shall be living,
In one of them, I shall be laughing.
And so it will be as if all the stars were laughing when you look
at the sky at night.
-- Antoine St. Exupery, The Little Prince