DW is hiding something, may be having and affair. Really need help...

Unfortunately, like so many that are posting here, I have an uneasy feeling that my wife of 10 years may be having or is about to have an affair. I don't have any concrete evidence at this point, and frankly it my not even be an affair, but I definitely sense she is hiding something from me. First some background. We have been together for 12 years, happily married for 10. We have a wonderful 7 yo daughter together and DW has been a stay at home mom since our daughter was born. Our relationship up to this point has been pretty much picture perfect, with only a few small bumps along the way. We really are soul mates and best friends and have a wonderful life together. Up until just recently, I have always trusted her implicitly and she has never done anything to betray that trust. I've never followed her, checked up on her, or tracked her because I never doubted her for an instant. Definitely what you would call a very trusting, transparent relationship. However a few weeks ago, I noticed several things that alone would be meaningless, but when put together could possibly paint the picture that she was hiding something from me. I was concerned, but I wouldn't call it overwhelming concern - just an uneasy feeling. I simply felt that I should be vigilant for any other signs. Then, the night before I was going to go out of town for business, I had what was the biggest sign yet that she may be hiding something. She was using her iPhone when I approached her and as she realized I had entered the room, she quickly closed whatever app she had been using. I wasn't able to tell for sure what she had been doing, but it looked most likely to be texting. There was no doubt in my mind that she had closed whatever she was doing because she didn't want me to see it. This was very unsettling, because we are very open and honest with each other and I had never ever seen her hide anything from me before. The next day while out of town, I was really dwelling on the the situation, thinking it would be stupid not to investigate. I was trying to decide what to do when I remembered that our iPhones have the "find my iPhone" feature. I had never used it before, so I set up the app and figured I would see where she was going in the mornings when our daughter is in school. I immediately determined that she was in a restaurant in downtown (big city) about 40 minutes from our home in the suburbs. We go downtown every month or two for a night out, and she occasionally goes downtown with friends on a weekend, but she never goes downtown by herself on a school day when our daughter is in school. This definitely had me more worried than ever, but it still could have a simple explanation. Maybe she was just meeting a friend for lunch. If this was the case, she would definitely mention it when I talked with her on the phone that evening. I knew if she didn't mention it, something secretive was definitely going on. Sure enough, when I talked with her that night, no mention at all. Now I'm really starting to freak out! I tossed and turned all night, mostly unable to sleep with nothing but one bad scenario after another running through my mind. As I travelled home the next day, I decided I had to confront her. I didn't have much to go on other than knowing her location, so I felt the only option was to attempt to trap her and hope she would tell me everything. When I arrived home, I started with, "I know what you did yesterday morning." Unfortunately it didn't work. She said she was having lunch with a friend and that she hadn't mentioned it over the phone because she had a lot to tell me and wanted to wait till I got home. She also said she was really hurt and surprised that I would track her like that and then attempt to trap her like the police trying to get a confession out of a suspect. Now here I am with the tables turned, I'm the bad one apologizing for my sneaky behavior! We talked about things at great length after which we both felt better. She convinces me that everything is fine and that my suspicions are just silly. The next day though, I still have this nagging feeling that something is amiss. When she was showering, I looked at her iPhone and found no unusual texts, calls or emails. Then I found one thing that is very concerning. Back when we both had limited texting plans, we had each installed an app called TextFree by Pinger. More than a year ago, we switched to a different plan with unlimited texts and we no longer used TextFree, though we still have the app installed. When I attempted to open TextFree on her phone, I found it to be password protected. The password the she and I both usually use for all our accounts did not work. Now I'm convinced that what I had witnessed last week before I went out of town was her closing TextFree when she saw me approaching. At this point I feel certain that if I could somehow gain access to the TextFree app, all my questions would be answered. It might be nothing, it might be something or it could be the sum of all my worst fears. Regardless, I feel I have to know! I am totally at a loss as far as what I should do next. I know talking to her won't help. She clearly wants to hide whatever this is. I feel that my options are: 1) Pretend everything is fine and then use any method possible to try to hack into TextFree. The problem is this could take some time and in the mean time, I'm just being ripped apart inside from the stress of this. Also, if she finds out what I'm up to before I get in, she probably will delete the app and work much harder to cover her tracks. Also it may be impossible to get in - I've already tried ever password I could think of. 2) I could tell her that I still have concerns that are not resolved and mention that I'm not comfortable with her TextFree app being locked. If there is nothing to hide she should have no problem opening the app and showing me what's in there. However, since I'm pretty sure she is hiding something, I have no idea how she will respond to being asked to open the app. If she refuses, I will have lost my chance as she will almost certainly delete the app and I'll never know what was in there. I suppose I could push really hard and say, "If you don't open the app I'll never be able to trust you. Even if opening the app reveals really bad and uncomfortable things, it is better to have it all out in the open so we can start the road to recovery. Failure to open the app will only lead to more suspicions on my part and things will just get worse and worse. You have to open the app right now or else our relationship will be on a really dangerous trajectory." I have no idea how she would respond to this or if this would be a good way to go about it. My previous method of trying to trap her and get a confession was obviously a dismal failure and frankly made me look like an ass. I don't want to make that mistake again. My marriage and family is the most important thing in the world to me. Losing this part of my life would be devastating, yet I know that I can't go on like this either. I know something isn't right and I have to know what it is. I have never been through anything like this in my life and I really don't know how to proceed. Any help would be greatly appreciated! BTW, I know this post is ridiculously long! I kept trying to shorten it but I felt all the details really mattered.

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