How is it possible for a man to move on with another woman after ten years of marriage to another that isn't even final yet?

I'm going to suggest another possibility besides "SOB" or "already gone", which is that he is emotionally a man-child.  In my mind, neither of the first two explain the immediate moving on--I believe such actions only rarely evidence a healthy "I'm ready to move on".  My suspicion is that he has a very puerile emotional need that dating will stroke, and that now that he's finally abandoned you as a source, he's seeking narcissistic hits elsewhere.  Of course my theory would be totally disproven if he landed in a very healthy, mature relationship, but I wouldn't bet those odds.

My STBX did the exact same thing. He had signed up for the first online dating service the week I moved out of the house. The marital termination agreement hadn't even been signed yet!
I realize he had been gone mentally and emotionally from our marriage long before I realized it. It is easier for him to move on because he has been waiting with bated breath for his "freedom" to do this out in the open.
It may be that he is looking for his next love or he could be more like my stbx, he wants to play the field, in which case the adreneline rush drown out everything else.
At least that has been my experience.

I think Mb pegged it, for many of us anyway. You know it's "done" unless something changes, and you do what you can to make those changes happen, but you finally give up because, well, enough is enough.

But all the while, you were letting go and realizing that what you have isn't what you need. And realizing that the only way to get what you need is to "move on". That's my story, anyway, and I'm sticking to it!

However, I suspect there are some s.o.b. types that do it just to get your goat; prove to you that you were wrong in not wanting to stay with them.

 

And I know there are some who think they are ready to move on and fall in love again, but really aren't; they're just kidding themselves. This one's a "know", not a "suspect" because that's how I ended up with my STBX. In retrospect, it was a bad move on my part from the git-go.

So, this time around, while I'm dating, and have joined several free on-line dating sites (which haven't panned out, yet...darn), I'm not looking for love, but just to make friends with women and do things with them. Practice the old, rusty social skills without falling into a committed relationship, so to speak.

For what it's worth, my counselor agrees this is a good thing, as one of my issues has been social anxiety. So long as no commitments are made, that is.

Probably not his situation at all, but I just wanted to give you a view from a different angle.

Take care.

I was 4 months pregnant with baby #5 when I left my 14 year marriage.  My ex was living with someone else before the baby was born.  I just figure anyone stupid enough to get involved with him deserved him!  She can have fin supporting him and paying his child support and bailing him out of jail when he doesn't.  He is not my problem anymore.  It has been 2 years, and I am still not even dating.  I prefer to work on myself and making me a better person, so when I do meet the right person, it will work.

Because he was gone before he ever left. 

My stbxh was so perplexed why it was so hard for me to move on after being with him for 28 years.  He had "left" our marriage long before he ever told me he was leaving.  So he had already gone through the process of separating himself. 

I don't think it's a male thing.  I know plenty of women who are able to disconnect just as easy.  It's just another sad fact of this process.

i think it is not that hard for a man to move on because

1. They will never tell the other woman the whole story.
So whil you know all the details of what you are going through she never will.
2. Because for men emotional attachment comes after time but with women if "physical time" comes fast then emotions do to. So while he's just interested she's falling in love and doing everything to reel him in.

I think this makes it so much easier for a man to seem as if he has moved on. They don't give themselves time in between they just go for the gusto and let that be their therapy.

I wasn't with or married to my husband half as long as you were but I am going through the same realization. And even though I know he is not for me I have wondered hoe he could move on so fast. He was imprisoned for a year when i completed the divorce. he got out and tried to profess his love to me. I wasn't trying to hear it and two weeks later he was engaged!