What is wrong with having an affair?

it is immoral and against all common deciency, when you are in a relationship you should love and respect your partner and remain 100% faithfull to them and not cheat or have an affair

ANSWER:

Just the word affair already saying how bad it is. In the eyes of God affair, or adultery is a sin to both man or woman who is married to another person. If you think that having an affair will make your marriage more exciting, I think you better think it, because most people who end up in an affair lost a lot. They do hurt the people they love just because they want to have another life away from their marriage. Your family will not trust you anymore, specially your own wife, or husband and the children if theres any. If this is not good enough reason it will be best to divorce your partner so the pain or humiliation will be less.