if u want to make this work then you need to make her fall in love with you again.. go on vacation.. or do something random.. bring home roses.. get off work early and make her a nice dinner.. etc etc.. women are crazy, but they are easily entertained if you know what buttons to press.. take a tantric sex class together... or do something constructive together.. something that you can bond together doing.. Marriage is not 50/50... it is 100/100 if you want to make it work you need to go the extra mile to break that mundaness of her life.. she is dissapointed with her life or unhappy for one reason or another and as a result is becoming unfaithful.. it is just something new for her entertainment.. i would not say it is too late to save your marriage