People believe that there are turning points in marriages after which it's impossible to save the marriage.
Today, I am here to tell you this is nonsense.
You can save your marriage regardless of how bad everything looks.
I learned this from a person who said the same thing, and I didn't believe in her; but in the end I ended up saving my marriage from what I thought was a totally hopeless situation.
My story of saving my marriage is rather long; with all the wrong and right things I did.
So I won't bore you with my story's details here (I give a link to my web page in which I tell of my experiences at the end, though; if you are interested, have a look at it.
) but I'll rather tell you what you must and what you must not do if you want your marriage saved.
Obviously, the first thing to do is to stop the "wrong" things: If you are walking the opposite direction of where you really want to go; to turn back, you have to stop walking in the wrong direction first.
 And that direction, in the case of your marriage, would be the "apologizing, trying to talk your spouse out of it, begging" type stuff.
After a certain point; "talking" to your spouse merely means you begging for forgiveness - and begging is a big no-no in all circumstances.
So you have to quit the "I can  / must talk my spouse out of this" phase.
After quitting that state of mind, you have to come to terms with the fact that there is no quick fix to your (or any) marriage: Marriages are long term things, and can't be cured overnight.
The right state of mind to truly repair a marriage is first to calm down and do away with the desperation.
 This will enable you to look at everything from a broader perspective and pinpoint your exact problems.
"Calm down" is a much crucial advice than it sounds - I can say that it was what saved my marriage.