Infidelity is unforgivable especially if you are married and have vowed in the eyes of the law to be with someone. It is also destroy a marriage or relationship.
Can you forgive them and give them another chance . Because of the welfare of your children if you already have and you do not want to destroy your family. Or you want to separate because you're hurt..
In many countries it is allowed but some countries have high punishment for this guilty.Maybe you can forgive if you love the person but don't deserved to be relationship anymore.