yes, but you know there is this think called karma.
If you throw something on the woman everyone is going to be repulsed by her.
you can use isa as a blinding rune and dim her to him if you invoke it that way. Becareful and don't actually blind him which yes, can happen. Invoke it gently and simply haze that woman out a little tiny bit is what you think when you are invoking it on him. It's still over kill and dangerous though.
A dulling glamour should not be done to her and no not notice glamours because she really will be in danger when she's driving -other cars won't notice her and will be constantly changing lanes into her and she'll be trying to avoid them. I'm not kidding. Don't do that to anyone because they really will be in physical danger if you do.
i know of a few binding spells to prevent adultery but i don't know how long or how well they work. why do you need this spell? is it your own insecurities that he may cheat, or has he in the past and you cannot forgive or forget? in both cases [even if you use a spell] you should focus on resolving these issues because this fear, doubt, and insecurity can drive you mad and will very likely result in you breaking up.