cook food for him everyday
prepare his clothes everyday
make him a sandwich, and do the dishes
never ask anything from him
make love to him as much as possible
dress sexy when you are around him
support him always and never nag
Do this everyday until he confesses of cheating on you. then leave him, this will teach him a lesson to not mess with a good wife.
if he never confess then at least you have a good married life.