I cheated on my wife because I didn't feel like I had a choice.
I do not think it is true that you did not have a choice, but why do you feel that way?
I've been married for a long time and I'm obviously not cut out for monogamy.
But the laws need to be followed and it is illegal to cheat, and being monogamous is how our society is built. Your wife's feelings will be hurt to know you're cheating on her, and if you do not feel like you're going to be loyal to her, then you should file for divorce as it will make her happier and less hurt that you are cheating.
Nah I don't want to do either of that. I want to make her jealous.
I feel like you're being vengeful against her even if she did not deserve it. If you have lost love for your wife, again, the proper way to deal with it is through divorce. I hope you do this so that she will find happiness with someone who would care for her and be loyal to her, as keeping her locked with you is actively making her life miserable.