I agree purple stain, saying that about men is horribly "generalizing"... obviously, not all men do that, if so, why do we have men in the same situation as us, at this moment, whose WIVES are having an MLC? I think all people do that, when they do not wish to face something, they DISTRACT themselves with FUN THINGS, or at least things they think should be fun. My h did that, he even said that in his letter here. Keep yourself so busy you have no time to think.... THAT WAS HIS SOLUTION to his problems, anything but FACING THEM!
Men and women alike, do this. MLC/ betrayal is not a "gender specific" affliction. Both sexes partake almost equally in this. I believe that as more women become as successful as men, you will see even more women suffering from this. Quite honestly, I think it is mostly just a means of coping with life, or at least starts out that way. Then the chaos and carnage becomes evident and people in general just don't know how to put the "genie back in the bottle". I think it is an attempt to put fun and happiness back in their lives and for most of us, those happy, irresponsible days were in our youth. So, when our lives become too much of a burden, when our inner happiness is screaming for attention, it seems like a natural starting point to me. The problem is, we are not 16 or 25, we are not single with no responsibilities..... takes a while to FIGURE that out sometimes.
Given time though, most do. Given time you will also rekindle your own childish zest and joy for life. Once that happens, you have a very good place to reboot your new life. Start fresh with the zest and zeal of youth but the wisdom of age. Seems like a darn good place to start from to me.
I wouldn't worry too much about the "why's".... in the end, it really doesn't matter. It will be what you MAKE of your own life, from this day forward. Whether you are able to use this to your advantage and rebuild yourself into a better person and hopefully, use what you have learned from this to rebuild a new life, with or without your spouse.