I am not alone, and I would not intrude the past upon my Guest
From A Course in Miracles:
T.16.I.3-12
Your part is only to remember this; you do not want anything you value to come of a relationship. You choose neither to hurt it nor to heal it in your own way. You do not know what healing is. All you have learned of empathy is from the past. And there is nothing from the past that you would share, for there is nothing from the past that you would keep. Do not use empathy to make the past real, and so perpetuate it. Step gently aside, and let healing be done for you. Keep but one thought in mind and do not lose sight of it, however tempted you may be to judge any situation, and to determine your response by judging it.
Focus your mind only on this:
I am not alone, and I would not intrude the past upon my Guest.
I have invited Them, and They are here.
I need do nothing except not to interfere.