You'll get no 2 x 4 from me because I know how good it feels to finally just let a stream of your feelings out on the person that initiated them. You may not have helped, you may not have hurt, but at least you let it out.
Sounds to me that, like my H, he 'taking things into his own hands'. To me, that means there is an OW pushing in the background. I think most H's want wives to file so they feel less 'to blame' about the whole thing if it turns out they were an a$$.
I want you to take one thing into account. You have done a tremendous amount of growing over the past few months. Don't think that went unnoticed by H. Probably put a scare into him. By filing, he could be trying to 'rein you in'; or 'put the fear of God into you'. My advice, FWIW, you had your say, now go dark. Do nothing. Say nothing. Let him stew. Saying and doing a thing are two different things. Just sit back and watch. Ask Seeking for more popcorn, with butter please.