About not saying anything at the departure. I think that's totally fine if you want to go for it, but the message could be really angry.
I just wonder if you should just put your eyebrows up a bit and go "see ya." Something that will make him think on the plane. if you don't say anything, he could just fume at you.
But it's up to you.
He is going to regret!!! He will, P!
Oh and your book sounds really really interesting.
