He's slowly realizing that his and your values on the subject of life are quite different, but he loves you and doesn't want to say " it's just a goddamn spider ffs, there's like a bajllion more" , so he holds it in and bites his tongue because he knows that for you even a lowly spider has value, even though in his heart he disagrees with that viewpoint.
So what happens in his mind is there is a battle in his soul that has now split in two, one that loves you and will try anything to stay, and the other that wants to keep his identity intact i.e. giving a rats as about spiders because you do while he himself doesn't.
The point is that you could get 1000x better help by talking and listening to each other, instead of coming to some lame advice website that's just other peoples opinions anyway.