Time for an Introduction...and Thanks

[figure-it-out]

WOW, surprised I was able to remember my log in information. It's been a long time since I've been on this board and so much has happened.
My H is still not living at home. I found out recently (on our 19th anniversary no less) that he is no longer living at his mother's either.
Unless he is hiding $$, which I don't think he is. He has found someone that is supporting him. My guess is it definitely isn't a man.
I think I may have made a big mistake recently and I'm not sure what to do. Any input will be much appreciated.
Since I found out he was not living at his mother's my thoughs have been "this is it, he's made up his mind, he's not coming home." I have asked him on several occasions that if this is the case we need to tell our children we are divorcing. (he filed in March of 2011). He said he would, but didn't know when, that it was hard for him, etc.
Via some texts late last week having to do with our refigerator at home dying I suggested he might want to tell the kids on Sat. when he came over to purchase a new one. He came over and said he was prepared to speak to them and told them we were divorcing.
I'm not sure now I did the right thing. I DON'T want to be divorced but know I can't stop it if he does. His actions indicate he wants nothing but a divorce (the moving in with a woman, etc.)
How should I proceed now? I have started packing the things he left behind and putting them in the garage.
We had been getting along well before, even ML when we had the opportunity. On a few weekends he would even decide to stay over rather than take our son to his mother's for the weekend.
Sorry to ramble. I'm just confused. I know my actions in regards to speaking to our children go against what I want to have happen. I guess I just felt with the new information I had received it was like "what's the point". I need to keep in mind all the stories I read here that have seemed so further gone but have been salvaged. Any feedback will be much appreciated.