I didn't see it, but just hearing about it caused me to lose respect for him.
I'm sorry, this isn't meant as an attack at all, just a request on my part to understand this viewpoint. Maybe it's me, but it did nothing to my respect for him, either gaining or losing.
And this is why: he's an athlete who is successful and talented in his chosen profession and made some bad personal decisions. It's up to his wife and family to decide on how they will hand this, not me.
Since he's never issued some kind of moral code to the world that needs to be stood up to, there's no reason to judge him.
However, if Tiger did something like, for example, Ted Haggard did: Ted set up a moral code, i.e. basically saying that homosexual acts are bad, then participated in homosexual behavior, then I'd have a reason to judge him. In that case, he's being hypocritical.
Tiger never did that. He was a golfer who was tempted by other women, and chose to give into that. To me, that doesn't deserve a loss of respect, certainly no gain of respect, but I'd chalk it up to being human. So would I now not buy something because Tiger promoted it? Is he less of a role model? Personally, I don't think so.
Again, I do not mean to attack or criticize your opinion. I am simply asking why you'd lose respect by merely hearing about him having an affair(s). I want to see understand why.