I usually don't care much for sappy quotes, but I always need to be reminded of this. Coveting is ugly, and, if left unattended, grows into jealousy. And jealousy can grossly interfere with God's plan for your life, but, even worse, it can interfere with His plan for someone else's life.
What difficult thing(s) have you had to let go of? What helped, or would have helped, make it a little easier? You thought is was real; and it was real at that time. Be gentle with yourself.