It's important for you to figure out if you are truly having second thoughts or just cold feet many couples get cold feet and fear when the wedding is getting close. You have to be honest about your feelings because this could make or break whether you get married or not. You have to think what if you call off your wedding and then find out that this guy is not the one for you and then you lose your fiance and are alone, could it possibly be that he wants what he cannot have or is he truly liking you and wants to start a relationship with you. This is going to be a hard decision because you don't want to look back years down the line and realize that you made a huge mistake. What you are going to have to do is consider if Rob is the relationship type or does he like to date around with many women, also are you truly in love with your fiance and want to spend the rest of your life with him and have children with him. You should never marry anyone when you have genuine second thoughts about the relationship. If you go into a marriage misery then more than likely the marriage is going to be misery and ultimately end in divorce. I think you are just having second thoughts because you are afraid of the commitment that comes with marriage. When it get closer to the date often time couples start thinking, "Am I doing the right thing by marrying this person?" or "Will this marriage really last" you may be afraid of the unknown that comes with marriage if this is your first marriage or you could be thinking that maybe there is better out there. You are going to have to do some contemplating about it, if you want to be married or do you think that you are not quite ready for that major step it's never too late to change your mind but you will lose alot of money but being sure is better than paying for a divorce later.