Is it normal? that i love my fiancee but dont in ways

Is it normal.. i have been with my fiancee 6yrs and now i'm having doubts if i love her or not it comes in too my mind thinking i love you so much but dont in ways, shes cheated on me 3times in the past and now everytime i think about it its not bothering me and when we go out shes dancing with other men and im alright with it now yet i love her but dont what is that please??? i always look at her as in what a mate would but yet i still have love there .... its like wering off slowly :( hellp ?