How should I feel after finding a yahoo personal ad that my fiance of 3 yrs

I came across it while incredibly bored. I thought I’d check to see if my brother had his ad still on the yahoo site, so I could be nosy and read what he’d written this time.. The search I did was for men in the area, aged around my brothers age. The first one that popped up was my fiance. Picture and all. Said he lived alone, with pets. He lives with me and OUR pets. Said he was single. Well, what am I? I confronted him, he said someone else did it, argued, then said it was 5 years old, (well the pic was, I admit that, it was taken back about 45 lbs ago), and the ad was NOT there 5 months ago, the last time I had searched for my brother’s profile.I made my fiance delete his profile (while he played dumb, I sat and instructed him to log in his email, edit profile, delete!) I’m not stupid by all means, I helped my brother with his profile, and I know how it operates thru your email, etc. But my fiance evidently thinks I’m computer stupid, because now he insists that it had to have magically appeared somehow, and that he didn’t do it! I told him that the web is not LuckyCharm Land and things don’t just ‘magically appear’. UGH> I have lost my trust in him, and now I’m thinking back on days he’d gone to town for something and was gone for 3 hrs, or how many times he’s walked away from me when his cell phone rang, to talk further out in the yard, or how many times I’ve been at work trying to call home with no answer, only to get ahold of him later on and he’d say he was sleeping and didn’t hear the phone.I’m driving myself nuts, and I don’t know how to stop it! I’m hurt, and he’s in denial. I’m doubting our relationship, and he doesn’t seem to care. He would never apologize, he thinks his denial is enough. How many other times has he lied to me! (I’ve seen his adamant ‘denial face’ before.)Oh, how can I stop questioning myself, I feel like I don’t know if he’s actually cheated or not? If I hadn’t been bored that day, I may not have searched for my brother’s ad, and still wouldn’t have known about my fiance’s ad. Questions, questions…I have thought about walking away, but I have so much time, energy, and work invested in this relationship. Everything we’ve bought together is in both names, I’ve completely landscaped the yards into beauty, and so much has merged. I don’t know why we havent’ gotten married yet, just too busy I guess. We’ve been living together as a couple, just haven’t said the I do’s.I have thought about revenge, placing an ad telling locals what he was doing behind my back. Not sure if yahoo personals would post it.I guess I’m through the crying part, now I’m at the mad stage. Any ideas out there???Note to add: the ad placed had said "active within the past week", and it is his house we live in now, I was renting when we met and he invited me here. The pets are 3 dogs (His, Mine, and an Ours) and the cat is mine. But we call them all Ours.The ad was not there 5 months ago, the last time I had searched for my brother. It was an old pic, but not an old ad.I guess I'm not through with the crying part. Reading some of your responses has me crying again. I am taking this very seriously, and having few freinds I can confide in, I am taking your advise to heart. Thank you everyone for giving me an outsiders view. I'm too tied up on the inside