This may or may not apply, but it entertains me to think about a lecture by someone who suggested the following technique for facing fearful situations (and I would call this a fear--that you don't mean something to Sparky):

Picture someone who has qualities you wish you had in that moment and step into their place.

So, in this case, I would imagine unaluna has the necessary qualities for this particular task, and that she would say, "I know you're gonna miss me, and you may never get over the growlycat shaped hole in your life, but I've got big plans for myself and you'll just have to find a way to deal with the pain of my departure." Or something that would not allow him to say something hurtful to you. Because, what's he going to say, No I won't miss you?

btw, does he know you call him Sparky? I would think he'd like knowing that.