Figuring out How to Hack Facebook

I know this sounds pretty bad, but I want to learn how to hack Facebook, so that I can see if my wife is talking to any other guys on her Facebook account. For awhile now, I have felt that she is growing more distant from me, and it kind of seems like it might be because she is having an affair with some other guy, behind my back. If that is what is going on, I want to find out, regardless of how much it is going to hurt me to find out. I do not think that I could ever forgive her if she was cheating on me, but I do not want to remain ignorant.

Part of me feels kind of bad, for suspecting her of something as serious as this.