HES CHEATING ON ME...PICS.! what should i say to her. ?

I am so sorry that you are living through this particular nightmare. The problem is this: why are you going to marry him if he is cheating on you now? From bitter experience, I have learned that cheating tends to be a chronic condition, and that confronting the girl--or girls--involved tends to get quite messy. Most of the time, the "other woman" has no idea that she IS the other woman! To add to the misery, often the "other woman" is upset and mortified--and will be more likely to take it out on you. If you want to settle this, simply cut your losses and let this man go. You have a life that is too precious to be involved with lies, deceit and heartbreak. Take care and God bless.