Maybe he's just enjoying having something that is all 'his'? You know, his style, his placement, whatever. I know that's the case with my xh. (Actually, we go shopping to pick out stuff for his place. Not my style, but it's a blast.)
The thank you message is a good positive.
Why go dark? It doesn't sound necessary. It sounds like you may just need some time to think and process for yourself. That's okay.
I still think this may be a good for you guys, in the long run. You sound a little less worked up.