Get the new furniture. You can always sale it if things work out. You need to make your WAH feel like he is losing you.

He wanted you gone? Fine, you moved. You took care of yourself. You are confident and unwavering. You are going to have the best life ever. You're not afraid (if you are, act as if).

Buying or not buying furniture will not play any role in the recon of your marriage. If anything, it adds a little pressure to WAH.

Plus, new furniture will not be a reminder of WAH. Its win-win!