Let go never means ignoring what we are going through, avoiding certain set of people and suppressing our emotions.
Letting go becomes a natural state when we feel the pain and heal the wound. That's the time when we move on to the next level, making ourselves immune so that same situation doesn't affect us again!
Everybody is fighting their own battles, everyone is busy in their own hassles. So if they do not answer your calls or they skip to revert on the text you drop, if they forget to wish you on special occasions or if they fail to give you due attention.
Just ignore my dear and accept them with their flaws. It is the time for you to show your affection and concern, may be they are tired and broken and awfully looking for only one such Person!