Find out the laws in your state. I am here in TX and if the other party doesn't respond or contest the divorce will continue. If no response then they give up rights to anything mutually owned potentially if the filer makes claim. As far as telling him, that is purely personal and depends on your relationship whether friendship/respect exists between the two of you.
Get educated and good luck
I just hope he don't waste my money like hw did before
Just refile and you go through with the divorce on your end.