I am so sorry for the loss of your Boots. He was/is a beautiful fella. What a beautiful tribute.

I believe that Boots waited until you were away, to go onto RB, as he knew how much you loved him and he wanted to spare you the pain and hurt of seeing him PTS, as he loved you too.
I hope you feel some comfort in knowing this.

May the loving memories of your precious Boots, comfort you and help you overcome the pain.

Rest in Peace Boots.