Morale Dilemma...help!

You'll have to excuse the scatter-brain story, I tried to write this in a hurry. Basically girl I work with brought me her boyfriends computer to fix. It bsod'd while he was using it, thought the drive was fried.

I pulled it, she told me to save all the pictures because that's all they cared about.

When copying all the files over I found a folder called PVT, not hidden, directly under My Pictures. I have folders set to preview, so I saw what was in it...and basically it's her...in very xrated ways...

But it gets worse. She supposedly knows about that, because she emailed me directly after and told me "Forewarning, folder called private has dirty things in it blah blah, might not want to open it hahahaha"...but that was after I already found it, so now I can't help but think wtf do I do...but the story gets better.

I was later copying bookmarks over, when the history came about...I thought...I wonder if his drive fried from a virus, lets see if it was from porn. (Probably shouldn't have gone there, I felt kind of morally wrong at that point but I looked before I let my conscience tell me otherwise). It was only a couple hours of history, he obviously regularly deleted if you know what I mean, but he couldn't because of the bsod this time.

Right away I noticed it was full of porn, which is fine, I'm not outing the guy because he likes porn, it's the type that threw me off... There were quite a few links to "happy ending" massage parlors, as well as submit your ex type sites.

Now I can't help but think...wtf...this guy is looking up local "happy ending" places, they just had a baby together...I can understand porn but that's not cool...

My curiousity got the best of me, so I looked up one of the submit my ex links on my phone, and low and behold he's putting her on those sites.

Now...I already feel guilty because I kind of snooped, and that's really not normal for me...and it's definitely not ethical, IMO, for me to have done that...but now I'm kind of stuck because if she doesn't know this is happening...that's pretty fucked...

First off...am I pretty much in the wrong from the start just for looking? And second...should I find a way to bring it up to her to make sure she's...aware...or do you think I would just cause myself issues...

My friend suggested that I tell her I was porting over the bookmarks and came across the submitmyex.com sites, and if she doesn't react to that to drop it because after all maybe she knows, but he said if she does react to that then to bring up the happy endings bit and let her really know what's going on.

Another friend suggested letting her know anonymously somehow, but I'm not sure how I would go about that...maybe a fake letter of confirmation from submitmyex.com to her email?

Spare me the "You shouldn't have been snooping in the first place" bit, because trust me, I already know that and frankly should know better given my career choice...but it's too late for that and now I know what's happening...

I don't really want to get flamed to hell for this, all I want to know is where to go from here.

WTF do I do?!

EDIT I caught that I spelt Moral wrong, but not until after I posted. Sue me.

EDIT 2 So far I've got:

• You're not a white knight, leave it alone
• Keep your mouth shut
• Nothing
• STFU about it

Getting some honest opinions, and I thank you for that.

I mean, I'm not trying to be their counselor, I'm just a guy working IT in a very open and not super to the books company, but still...anyone have any reason for the other side or why I should tell them?

I still haven't decided yet what to do, I just want more ideas and to see what a majority of the consensus is.