Have Relationship Questions? Ask a Counselor for Answers ASAP
-- Having affairs is being dishonest, unethical and shows lack of character. If he did something like this to you, you'd be hurt, feel betrayed and have a low opinion of him, wondering how dishonest he is in other areas of his life.
Follow your feelings and stay true to your morality. It is better to end the relationship than betray the trust he has in you.