If letting go of things were easy, a lot of people wouldn't be reminiscing on things that still hurts.
"Accept your heartbreak. One can not stop pain. Pain is meant to be felt. Cry if you must. Let it consume you if you must, and then allow it to be over..."
Don't be concerned with forgetting, moving on, letting go or anything people tell you that you need to do.You will do it in your own time,if you need to. It will happen when the time is right and no matter how much you want to control things, you can't.
"...Say goodbye after having fully experienced it. Learn from it, learn the meaning of decisions. Afterwards, you will admire your courage and your strength. Then you'll never allow anyone to break you in the same way again. " Mirtha Michelle
So, if there is something to let go of, let it be the pressure you have given yourself to feel nothing/get over/be at a certain point in your healing. Its okay to not be okay. Its okay to not be ready to let go.