DEAR ABBY: Recently, my oldest and dearest friend (since kindergarten) talked about renting a house in Puerto Rico for her family and mine. We talk often and have remained close over the years. I consider her family a part of my family. She recently informed me that she went ahead and booked the trip with her sister-in-law, her nephews and her parents without saying a word to me about it. I was extremely hurt, and when I told her so, her answer was, “Well, I didn’t make the arrangements; my sister-in-law did. There will be small children, and I know you don’t want to do that.” (I had told her …