@ASDO16,
I'm not a rabid anti-affair person, but I'm not for them at all for many reasons, unless it is something unusual, as in the spouse concurs, and even then, there would usually be the other spouse that is getting cuckolded. Aside from the matter of morality re breaking the wedding vows, and aside from the thrill of fooling around, there is the likely wrenching of lives. Thus, the main problem is stupidity - the under estimation of possible trouble on the home front, the embarrassment on being caught, the avoidance of dealing with what is wrong with your marriage, the matter that you may just be bored and need a new hobby.
Some people vow differently than the usual. I've a friend who with her to be husband vowed to love each other until they didn't, or some words to that effect. Together 35+ years now.
I do get that a new person can illuminate your life and make you realize you married the wrong person. Then I'd say, deal with dismantling the marriage, and consequences thereafter. Divorce is an option.