I Should Have Known Better

I should have known better.  I should have thought about what I was told and the source it was coming from.  I should have realized that a leopard can't change its spots.  I should have known that you can't teach an old dog new tricks.  I was fed a lie and swallowed it hook, line and sinker.  I should have known that even though she looked me straight in my face and told me she was going to do better, that my wife was not going to change.  I should have known better.