Indecisiveness or something else?

I filed for a legal separation four months ago.  I told my husband immediately.  I served him with the papers two months ago.  I asked him to move out of our house temporarily for the autumn (for various reasons, including that our children aren't around, this seemed like a good time to try out a physical separation).  

I've told my husband that my feelings are still mixed about staying together versus splitting; I've told him about the things about the marriage that disappoint me.  

But during this entire time, my husband has not once expressed an opinion about whether he wants to stay married or he wants to split up.  

People with ADHD and people without, do you have any thoughts about why my husband isn't saying anything?