It is a fact of human life that, from time to time, we grow distant from those who we love. There are several reasons for this. Things happen in our life that take us to different places, and we cannot cover so much ground. Many of us have a number of friends and acquaintances and cannot be in contact with all of them at the same time. Christmas can be useful in repairing some of the damage that this does, and this is a major reason why it is seen as being a time of togetherness.
Whatever we may think at a given time, no friendship or relationship needs to be considered completely broken if one or both parts of it feel that there is a chance of reconnection. There may be a lot of hurt there, but Christmas allows a focus on things that we thought were lost. It is a time when many people feel that there is a chance for forgiveness, for apologies and acceptance. Whatever we feel may have been lost, we can focus on bringing back the good times.
Of course, Christmas is only here for a month, or a few weeks, and then we have to refocus on the world without Christmas in it. This is when the true test of what has been rebuilt comes, and if we are not truly committed to making it happen then it can still fall away again. But if you feel that you would like to reconnect with someone you had lost contact with, Christmas is the time to make it happen.