monogamist
nounOne who has been married only once; one who believes that a person should not marry oftener than once —that is, that a widower or widow should not remarry.
nounOne who has but one (living and undivorced) wife, as opposed to a bigamist or a polygamist.
nounOne who practices or upholds monogamy.
nounA person who practices
someone who practices monogamy (one spouse at a time)
