Wobbly
Yes it really, really is. Believe me.
But how you judge this depends on your politics, your humanity to other women and whether you view the world through a wider lens than your own relationship and personal comfort.
If it's the latter, just about the only thing that is 'better' about your decisions regarding the marriage is that they become easier. There are no dilemmas about a good person doing a bad thing, making what is a very human mistake. A man who uses prostitutes is just a bad man doing a bad thing, based on his inherent misogyny.
This is not to downplay the agony and horror of an affair, but unless there has been coercion and misuse of power involved, people enter into an affair on an equal footing and give of their time and affection freely. Even if it is billed as a no-strings attached affair based on sex, there is mutuality of free choice.
Not so with a transaction in the sex industry. The relationship is based solely on a man's ability to pay a woman and he couldn't care less what's led her to prostitution. For him, nothing is more important than his orgasm. He also puts the women he pays in the 'sex class' and regards them as not quite human. This way of thinking allows him to lead a double life and affect the demeanour in his 'other life' of respecting and liking women. It allows him to hide the fact that he despises them and wants to control and punish them, usually for his own inadequacies.
He thinks it's okay as long as he can delude himself that prostitutes are not like his wife, mother, sister, colleague and friend and as long as he never makes the link between what he is doing and its impact on all the women he claims to respect. Though quite how anyone can pretend that having sex with a prostituted woman, using the family budget to pay for it and exposing one's partner and child to disease is a discrete activity than can be compartmentalised, requires a chilling ability to compartmentalise and self-deceive.
Then again, I think it needs a peculiar set of 'marital bargains' to be made to convince yourself that it's better that a man has no feelings of respect or kindness for the woman he's sleeping with and treats her like a hole to spunk into. I don't know how anyone can convince themselves that a man who does that is a better human being than one who has has an ill-judged affair but it's not an emotionally healthy response and suggests that the relationship and the man have assumed more importance than one's personal integrity and humanity.