I feel bad for the fiancée😅 I mean no wonder that she was insecure & bitchy, she must ofc have sensed those suppressed feelings between them from both of them, it's very common when you really love & know someone, you can almost always sense when something isn't right or as usual, regardless what it's about even when your partner is lying to him/herself, or isn't quite sure what him/herself actually feel, or even why & often therefore doesn't share it with you..