How do you save a failing marriage especially after spouse affair?

yes. but only with consistency and determination. you must have the love of

God within you to begin the healing process or else old, hard, bitter feelings will keep rehashing. do you love the person? is this a one time affair? love will always find a way because only it knows and understands what trails and tribulations are all about. you both will need each other and counseling from God and from man won't hurt either. also lots or good sex and constant kissing(deep kissing) works.