When you are blessed with your husband or treat him like a king, treat your wife like a Queen (life won’t give second chance). Life won’t give you chance to get back your wife, or your husband. Think before you do. It takes sincere effort from both side equally. A one sided relationship never survives.
Any form of relationship between man and a woman, which is called and the unlawful and illicit relation is Haraam. It doesn’t matter if it goes as far as being intimate(Zina) which is indeed most hated, reprehensible and abhorrent type of a sin. It poses a great danger to individuals religious commitment and faith, or it is less than that, such as looking, touching or kissing. All of that is haraam and these are types of Zina in the general sense and are things that lead to the greater immoral action.