My fiance says she loves another guy?

Ok so ive been dating this girl for 4 years a few months ago we got engaged now she tells me she loves another guy but that she loves me too and that she lost and doesn't know what she wants i gave her what she wanted was space and we are on a break but recently ive found out shes been seeing this guy often and praising him all over her facebook and stuff wait theres more the dudes in jail!