I'm thinking of cheating on my wife
I hope you're kidding, why would you cheat on your wife?
I'm kinda fed up with her.
Your marriage is a legally recognized partnership and cheating will only complicate matters. Talk to your wife about your issues and see if there's any way you can save the marriage without betrayal.
It's just a thought. I don't have any plan to actually do it.
Even still, just thinking about cheating on your wife is a bit wrong. You definitely should try and get closer to your wife so that you don't have these sort of thoughts.