Well I shouldn't talk, im sorta in the same problem, and I wish it all could disappear, but like they say, good people learn the hard way !!
One thing I've learned over the years is that life is really F-ing complicated. (This is not, by the way, a defense of Tiger, whose issues are indeed complicated and way, WAY beyond the pale of typical infidelity.) I just know that when I was in my 20's, rupturing the sanctity of marriage was wildly out of bounds, impossible for me to comprehend and totally unforgivable.
While I take my marriage vows seriously, and while I have never strayed and expect never to do so, age has taught me that those who do sometimes face bizarre circumstances, pressures, bouts of unhappiness and, frankly, a newfound lack of connection with one's partner. I'm not trying to defend it, or Tiger, or you, here, but I do try to be understanding of how F'd up things can get in ANY relationship - work or "play" or BOTH, which probably best describes marriage - and that people, myself anyway, aren't fully equipped to comprehend or judge other folks' downfalls.
Best of luck with your situation. And thank you, Tiger, for making at least one blooper reel entry per week like shooting fish in a barrel of skanky Vegas text-savers. See? Easy!