I know how you feel Grace. My H emailed me last week asking if I could expedite our separation agreement as there is a property he wants to be able to put an offer on. One more step towards the D that I don’t want.
I think you are smart not to email him back right away. You may even want to consider not emailing back at all or just email “Thanks for the info. Send me the address when you have a chance” and leave it at that. Don’t ask about a divorce unless you want one. Patience, patience, patience.
Honestly, your H sounds like he really is messed up and is going through a genuine MLC. He needs to work through it. Just keep giving him the space and time to do it. I firmly believe he will reach out at some point. You may or may not care by then. Keep the focus on you. I think you’ve been doing really, really well.
I wouldn’t worry about the “downside” comment. My first thought is that he likely said it because he thought you would be upset. What a great opportunity for you to show him the opposite and make him think about what he could be losing.