You should meet my ex-wife. When I confronted her about infidelity, she actually brought up our non-traditional wedding vows and how they didn't have the explicit phrase "foresaking all others" as a way to say she "misunderstood" that I expected monogomy all those years. Of course, if she really believed that, then why would she hide her infidelities?
By the time that happened I wanted out like you, but the exchange was interesting - in hindsight.