Let's remind ourselves of something once again.
husband snatcher this husband snatcher that who really is at fault here? Our comments today might save a relationship tomorrow hence I begin with my brief opinion.

I for one am of the opinion that the men are to be blamed this is why I say so without any apologies.
Before you claim to be snatched away, why don't you stop and think. What does this new woman have that my wife doesn't have? Oh my wife is on the + side now she has added extra pounds (you can't tell me she became ugly unless you were blind for the entire period of courting, you can't tell me she has bad habits unless you were not observant enough are you were blinded by emotions).

As far as I am concerned if this is the reason ( I mean the extra size ish) then you simply don't know what you want. A good woman is a good woman irrespective of how she appears to the eye, what matters is how she appears to the heart.
Let's start always with the man in the mirror.