There's a limit to the "worse" part in every religion and form of Christianity, and usually mispresentation (aka fraud, lying, etc.) is usually one of the ones that will void your marriage in the eyes of God.
I think that you are taking the vow out of context, and need to realize that giving some one aids (knowingly or not) is pretty much killing them. If my husband cheated on me and brought home anything, I'd be gone. It's not only betrayal because of the cheating, it's saying that he didn't even respect himself, our relationship, and potentially any children by not using protection.